Light needs to re-enter through the body, not through the concept of recovery. Sunstone is feldspar with oriented copper or hematite platelets that throw aventurescent flash from inside the crystal. The flash comes from inside the crystal, not from the surface.
Intent
Confidence & Power
Boundaries & ProtectionJoy & WarmthMotivation & Energy
Sunstone is a sacral and solar plexus stone traditionally used to activate joy, personal power, leadership energy, and the body's capacity to be visible without...
Overview
The heart of the entry
Light wants to come back through the body, not just the idea of optimism. Sunstone is feldspar with aventurescent...
Mineralogy
Feldspar Group
Sunstone is a member of the feldspar family, specifically the plagioclase series ranging from oligoclase to...
Formation
How it forms
Triclinic system — earth conditions, structure, and place.
Crystal system diagram represents the general triclinic classification. Diagram created by Crystalis for educational reference.
What your body knows
Confidence & Power
Sunstone is a sacral and solar plexus stone traditionally used to activate joy, personal power, leadership energy, and the body's capacity to be visible without...
The Meaning
Sunstone in the Crystalis dictionary
Light wants to come back through the body, not just the idea of optimism.
Sunstone is feldspar with aventurescent platelets, usually copper or hematite, creating warm internal flashes that feel solar without leaving the mineral family of grounding structure.
The sparkle belongs to inclusions.
That makes the radiance feel earned.
Stone Lore
Stories carried through time
Cultural notes are presented as tradition and historical context — stories carried through time.
Norse / Viking Tradition, c. 800-1100 CE
"Sólarsteinn" — The Navigating Stone
The Icelandic sagas reference a "sunstone" (sólarsteinn) used by Norse navigators to locate the sun's position through fog and overcast skies during open-ocean voyages. While scholarly debate continues about whether this was optical calcite (Iceland spar) or feldspar sunstone, the cultural association is definitive: Norse tradition links sunstone to wayfinding, courage during uncertainty, and the ability to find light when the world turns dark.
Archaeological finds of calcite crystals in Viking shipwrecks (such as the Alderney crystal, c. 1592) have been studied for their polarization properties. The cultural legacy is clear: sunstone was the navigator's stone, the one that found the path when the sky gave no direction.
Ritual history
Helios Stone — The Solar Offering
Greek tradition associated glittering golden stones with Helios, god of the sun. Temples dedicated to solar deities incorporated golden and shimmering minerals as votive offerings. Pliny the Elder (23-79 CE) documented various shimmering...
Ancient Greece, c. 500 BCE - 200 CE
Historical note
Oregon Sunstone — Stone of the High Desert
The sunstone deposits of southeastern Oregon's high desert were known to indigenous peoples of the region long before European contact. The Northern Paiute and other Great Basin peoples inhabited these lands for thousands of years. Oregon...
Native American / First Nations, Pre-Contact to Present
Ritual history
Surya's Fire — Solar Energy in Practice
In Vedic and Hindu traditions, sunstone (suryakanta mani) is associated with Surya, the solar deity, and with the Manipura (solar plexus) chakra. The stone is used in Jyotish (Vedic astrology) as a remedy for weak Sun placement in the...
Hindu / Vedic Tradition
Historical note
The Premium: Copper-Bearing
The only known source of copper-bearing gem feldspar. Oregon sunstone can show red schiller, green dichroism, and rare color-change phenomena. Transparent to translucent. Facet-grade material commands premium prices. The copper creates a...
Sunstone is a member of the feldspar family, specifically the plagioclase series ranging from oligoclase to labradorite in composition. Its chemical formula is (Ca,Na)(Al,Si)₂Si₂O₈, meaning it contains varying ratios of calcium and sodium that determine where it falls along the plagioclase spectrum. The crystal system is triclinic: three unequal axes, none at right angles. Asymmetry built into every unit cell.
What makes sunstone sunstone is aventurescence : a metallic glitter effect caused by light reflecting off tiny platelet inclusions of copper, hematite, or goethite suspended within the feldspar host. These platelets formed during the stone's crystallization from magma.
Crystal system diagram represents the general triclinic classification. Diagram created by Crystalis for educational reference.
Triclinic structure
Chemical Formula
(Ca,Na)(Al,Si)2Si2O8
Crystal System
Triclinic
Mohs Hardness
6
Specific Gravity
2.62-2.65
Luster
Vitreous to subvitreous
Color
Orange, Red-Orange, Gold with aventurescence
IMA Status
variety
Type Locality
N/A (no specific type locality)
IMA Number
No IMA number (variety of Feldspar Group, not approved species)
01
Mineral conditions gather
02
Structure begins to crystallize
03
Sunstone records place and pressure
Oregon USANorwayIndiaCanadaRussia
Telling it apart
The Sparkle Test Tells You Everything
Hold both stones side by side. Real sunstone has irregular, naturally distributed shimmer that shifts and moves as you rotate the stone. Goldstone has perfectly uniform, evenly spaced sparkles that look manufactured. Because it is manufactured.
Sunstone (Natural)
Origin: Natural feldspar mineral from volcanic basalt
Sparkle: Irregular, shifting aventurescence from copper or hematite platelets
Color: Golden, orange, red-orange, sometimes with color-change
Inclusions: Natural, irregularly distributed
Hardness: Mohs 6-6.5
Feel: Cool initially, warms gradually to body temperature
Goldstone (Man-Made)
Origin: Glass with copper flecks, manufactured since 17th century Italy
Sparkle: Perfectly uniform, evenly distributed glitter throughout
Color: Copper-orange (also available in blue and green)
Why this matters: Goldstone is sometimes sold as sunstone, either through ignorance or deception. Goldstone is a lovely material with its own merits, but it is glass, not mineral. If you are working with sunstone for its feldspar properties, its volcanic origin story, its copper-bearing aventurescence, you need the real thing. The sparkle test takes three seconds.
Sunstone Varieties by Origin
Oregon Sunstone
The Premium: Copper-Bearing
The only known source of copper-bearing gem feldspar. Oregon sunstone can show red schiller, green dichroism, and rare color-change phenomena. Transparent to translucent. Facet-grade material commands premium prices. The copper creates a shimmer unlike any other sunstone source. Mined from Rabbit Basin and Plush in southeastern Oregon.
Norwegian Sunstone
The Original European Source
Typically oligoclase feldspar with hematite and goethite platelets. Warm orange aventurescence. More opaque than Oregon material. This is the sunstone that Viking sagas reference and that gave the stone its European name.
Indian Sunstone
Major Commercial Supply
India produces large quantities of commercial-grade sunstone with hematite inclusions. Typically softer orange shimmer, good for tumbled and polished pieces. The bulk of affordable sunstone in the global market originates here.
Tanzanian / Madagascan Sunstone
African Varieties
East African deposits produce sunstone with distinctive warm golden tones. Some Tanzanian material shows excellent transparency and strong aventurescence. Madagascar sunstone tends toward softer, more diffuse shimmer. Both are emerging as quality sources in the global gem market.
Care & Maintenance
Spotting the real thing
Five tests. No special equipment needed. The sparkle test. Rotate sunstone slowly under a light source. Real sunstone shows aventurescence: a shifting, irregular shimmer that moves and changes as the stone turns, because natural copper or hematite platelets are distributed unevenly along crystal planes. If the sparkle is perfectly uniform, evenly distributed, and does not shift as you rotate, you are holding goldstone (man-made glass).
The difference is immediately obvious once you know to look. Temperature test. Real sunstone (feldspar) warms in the hand gradually and holds warmth. Glass (goldstone) stays cooler for longer and warms differently. Pick up both. The feldspar feels different from glass within 30 seconds. Trust your hands. Hardness test. Sunstone is Mohs 6-6. 5. It can scratch glass (Mohs 5. 5). If the stone cannot scratch a glass surface, it may be softer than feldspar.
You have been dimming yourself. Not because you lack capacity, but because somewhere along the way, being visible became unsafe. You speak quieter than you need to. You defer when you could lead. You shrink in rooms where you belong. The brightness is still in you.
Exhausted from being everything to everyone. Your needs are the last ones on the list. You say yes when the body screams no. The smile is genuine, but it is load-bearing. Somewhere underneath the accommodation, the real self has been waiting for permission to want something of its own.
Sunstone's role: The independence stone. Sunstone at the solar plexus activates the center of personal will, not aggressive will, but sovereign will. The quiet, unshakeable knowledge that your joy matters as much as anyone else's. The warmth at the solar plexus reminds the body that self-worth is not selfish. Sunstone is traditionally associated with benevolent leadership: the kind of power that leads by radiance, not by force. For the people-pleaser, sunstone does not create selfishness. It restores the self that was abandoned in the service of others.
Settled & connected
The Joy Drought
Nothing is wrong, exactly. But nothing is right either. The color has drained from daily life. Pleasure has become an intellectual concept rather than a felt experience. Food is fuel, not delight. Music is noise, not medicine. You remember what joy felt like but cannot access it. The nervous system has flatlined into efficient survival, and survival has no room for delight.
Sunstone's role: Joy activation. The golden shimmer of sunstone is not decorative. Warm-spectrum color engages the visual system in a way that cool-spectrum colors do not. Research in color psychology demonstrates that gold and orange tones increase positive affect. Holding sunstone in natural light, watching the aventurescence shift and flash, gives the nervous system a micro-dose of delight that bypasses the mind entirely.
The eyes see beauty. The chest responds. For the joy drought, sunstone is not a replacement for what was lost. It is the reminder that the capacity for joy is structural. It does not disappear. It waits.
Charged & on alert
The Imposter on Stage
The presentation is in twenty minutes. The interview starts in an hour. You are about to walk into a room where people will look at you, evaluate you, judge you. The preparation is done. The competence is real. And yet the body is flooding with cortisol, the hands are trembling, and the internal narrative insists you do not belong here. Imposter syndrome is a nervous system event, not a cognitive one.
Sunstone's role: Grounded visibility. Sunstone held in the non-dominant hand or placed in a pocket at hip level (sacral zone) addresses the gap between competence and confidence. The weight grounds. The warmth reassures. The golden shimmer in peripheral vision acts as a somatic anchor: I am here, I belong here, and the light I carry is real. Sunstone does not eliminate the anxiety of being seen. It converts that energy from panic into presence.
Winter. Short days. Gray skies for weeks. The body responds to light deprivation the same way it responds to emotional withdrawal: it dims. Energy drops. Mood flattens. The impulse to hibernate is biological, not laziness. The nervous system is rationing resources because the signal for abundance (sunlight) has disappeared.
Sunstone's role: Portable light. Sunstone's aventurescence literally captures and reflects light. Holding it near a window, even on a gray day, produces warm-spectrum shimmer that the visual system processes as light. Research on light exposure and mood confirms that warm-spectrum light input supports circadian regulation and positive affect. Sunstone is not a replacement for a light therapy lamp.
But as a somatic practice object that can be held, warmed, and visually engaged, it provides a micro-intervention for the light-deprived nervous system. The Vikings reportedly used sunstone to locate the sun through overcast skies. Whether that was optical calcite or feldspar sunstone, the principle holds: this is a stone that finds the light, even when you cannot see it.
These associations come from tradition and reflective practice — a way of working with the stone, not a medical prescription.
Somatic Practice
Simple ways to work with Sunstone
◇
Hold
Carry Sunstone in a pocket or place it over the heart center during a pause.
◌
Meditate
Let the stone become a quiet tactile anchor while the breath slows.
☽
Breathe
Breathe in softness. Breathe out tension. Keep the practice simple.
✎
Journal
Write with Sunstone nearby to name the feeling without forcing a conclusion.
✋
Bodywork
Rest the stone near the chest, hand, or bedside as a reminder to soften.
⌂
Environment
Place it where you want a visual cue for care, repair, or steadiness.
Field Instruction
The Radiance
Sit in Light. Breathe Wide. Expand.
3 min protocol
1
Sit near a natural light source. Place sunstone flat against your solar plexus (the soft space between ribs and navel), held with both palms. If sunlight is available, face it. If not, any light will do. The stone should sit where the diaphragm meets the belly. This is the power center: Manipura. The seat of personal authority, confidence, and the will to be present. Close your eyes halfway. Let light filter through the lashes. Feel the stone's weight settle against your center.
2
Breathe: slow inhale through the nose (4 counts), expanding the ribcage laterally like opening a window. This is not belly breathing and not chest breathing. Breathe sideways. Feel the ribs expand outward, making the torso wider. Each inhale is an expansion: you are taking up more space. The exhale is slow through the mouth (6 counts), maintaining the width. Do not collapse on the exhale. Stay expanded. This lateral breathing pattern activates the intercostal muscles and communicates to the nervous system: I am safe, I am present, I am not shrinking.
3
On each exhale, visualize warmth radiating outward from the stone's position, like light expanding from a lantern. This is not imagination. The stone is absorbing body heat and radiating it back. Feel the warmth spread from the solar plexus outward through the chest, the shoulders, the arms. Let the warmth reach the face. Let the jaw soften. If the eyes want to open more, let them. You are practicing being visible from the inside out. The warmth is the beginning. The radiance follows.
4
After 3 minutes: open your eyes fully. Look up. Lift the chin slightly. This is the posture of someone who belongs in the room. Notice: is there warmth in the chest? Is there a softening in the shoulders? Is the breath wider than when you started? That is your solar plexus, activated. The warmth you feel is yours. The stone amplified what was already there. Take the stone with you. Let it sit in a pocket, against the body. Carry the warmth into the next room you enter.
Stone Intelligence
The fact that makes Sunstone memorable
Sunstone begins as copper platelets trapped in feldspar during volcanic cooling, 15 million years ago in Oregon basalt. The aventurescence is physics: light reflecting off metallic inclusions at precise angles. The warmth at your solar plexus is thermodynamics: a mineral absorbing and returning body heat.
What you do with that warmth, that shimmer, that permission to be bright, that is where science becomes practice. The mineral is real. The radiance it activates in you is also real.
Both deserve the same rigor.
SCI
Cu nanoparticle geometry as the key to bicolor behavior in Oregon sunstones: An application of LSPR theory in nanomineralogy
Sunstone for Reclaiming Visibility: When you have been dimming yourself because being visible became unsafe, hold sunstone at the solar plexus. Two channels fire. Visual: the aventurescent shimmer, the flash of copper catching light, creates a reminder that brightness is a natural state. You watch light dance inside a stone, and something in the chest recognizes the permission. Somatic: warmth and gentle weight at the center that governs personal power and self-worth. The signal is precise: it is safe to be seen.
Sunstone Radiance Protocol for Expansion: Sit near a natural light source. Place sunstone between ribs and navel, held with both palms. Breathe sideways: slow inhale expanding the ribcage laterally like opening a window. Each inhale is an expansion. You are taking up more space. Exhale slowly, maintaining the width. Do not collapse on the exhale. Stay expanded. This lateral breathing pattern communicates to the nervous system: I am safe, I am present, I am not shrinking.
Sunstone for People-Pleaser Exhaustion: When exhausted from being everything to everyone and the real self has been waiting for permission to want something of its own, hold sunstone as the independence stone. The aventurescent shimmer models something the nervous system needs to see: light that moves on its own terms.
Sacred Match
Sacred Match prescribes Sunstone when you report:
Dimming yourself
Joy has gone flat
People-pleasing collapse
Imposter syndrome
Seasonal low energy
Afraid to lead
Sacred Match prescribes through physiological diagnosis, not preference. It queries the nervous system: current sensation, protective mechanism, and the biological need masked by both. When that triangulation reveals solar plexus collapse (personal power withdrawn, joy flatlined, or a body that has decided visibility is dangerous) sunstone enters the protocol.
Pairings are treated like a recipe file: clear use, method, and safety.
Crystal Companion
Sunstone + Amethyst
Use when
Moonstone (sacred balance of solar and lunar energy), carnelian (double sacral activation for creativity), citrine...
How to work with it
Place the stones together during meditation, journaling, or a short reset.
Safety
Use as a reflective practice tool, not as a medical substitute.
Crystal Companion
Sunstone + Rhodonite
Use when
Moonstone (sacred balance of solar and lunar energy), carnelian (double sacral activation for creativity), citrine...
How to work with it
Place the stones together during meditation, journaling, or a short reset.
Safety
Use as a reflective practice tool, not as a medical substitute.
Crystal Companion
Sunstone + Clear Quartz
Use when
Moonstone (sacred balance of solar and lunar energy), carnelian (double sacral activation for creativity), citrine...
How to work with it
Place the stones together during meditation, journaling, or a short reset.
Safety
Use as a reflective practice tool, not as a medical substitute.
Crystal Companion
Sunstone + Black Tourmaline
Use when
Moonstone (sacred balance of solar and lunar energy), carnelian (double sacral activation for creativity), citrine...
How to work with it
Place the stones together during meditation, journaling, or a short reset.
Safety
Use as a reflective practice tool, not as a medical substitute.
Moonstone
The sacred balance. Sun and moon. Solar and lunar. Active and receptive. Sunstone activates the solar plexus, moonstone soothes the sacral and crown. Together they create the complete light spectrum: radiant personal power tempered by emotional intelligence and intuition. For leaders who need both strength and sensitivity. The classic pairing across virtually every crystal tradition. Day and night in the palm of one hand.
Carnelian
Double sacral activation. Sunstone provides the radiant warmth and joy, carnelian provides the raw creative ignition. Sunstone says "shine," carnelian says "begin." Together they address the person who knows they have something to create but needs both the courage to start and the confidence to be visible. For artists, entrepreneurs, anyone launching something that requires showing up.
Citrine
Solar plexus amplification. The golden pair. Sunstone provides the sovereign joy and radiance, citrine adds manifestation energy and abundance frequency. Both are solar plexus stones, both work with warm-spectrum energy, and together they create a concentrated field of personal power. For financial confidence, business growth, or any situation where abundance needs to flow from authentic self-worth.
Labradorite
Light and transformation. Both are feldspar minerals with optical phenomena (aventurescence in sunstone, labradorescence in labradorite). Sunstone radiates outward, labradorite transforms inward. Together they create the full cycle: inner transformation expressed as outer radiance. For transitions, identity shifts, and stepping into a new version of yourself that the world has not yet seen.
Clear Quartz
Amplifier. Clear quartz takes sunstone's radiant signal and broadcasts it louder. For someone whose solar plexus is deeply dim, clear quartz makes a modest sunstone work like a powerful one. The amplification is non-directional: it strengthens whatever energy it sits beside. Pair when the radiance needs more reach.
Pairing Cautions
Sunstone + Black Tourmaline: These stones work at cross purposes. Sunstone expands and radiates outward. Black tourmaline contracts and shields inward. Using both simultaneously can create a push-pull sensation in the nervous system. Use sequentially (tourmaline for grounding, then sunstone for activation) rather than simultaneously.
Sunstone + Moldavite: Extreme acceleration. Sunstone already activates. Moldavite intensifies everything. Together they can produce restlessness, overstimulation, or emotional flooding. For experienced practitioners only. Most people do not need two accelerators at once.
Care & Cleansing
How to keep Sunstone in good condition
Water Safe?
Water safe
This stone is generally safe for short water contact, though polishing, fractures, and metal settings can still change how a specimen behaves.
Sunlight Safe?
Sunlight safe
Tolerates daylight; safe to charge or display in the sun.
Authenticity
What to check
Natural Sunstone should usually feel cooler than plastic or resin on first touch and warm more slowly in the hand.
The #1 Question
Can Sunstone Go in Water? Yes, safe
The Full Answer
Sunstone scores 6-6. 5 on the Mohs hardness scale and contains no water-soluble minerals. The copper and hematite platelet inclusions are metallic and structurally stable. Water will not dissolve, scratch, or structurally damage sunstone in the timeframe of a cleansing rinse. Safe: 30-60 seconds under cool running water.
This works for both energetic cleansing and physical cleaning. Pat dry with a soft cloth. Avoid:
Thermal shock: sudden temperature changes can exploit feldspar's perfect cleavage planes and cause fractures along {001} and {010}
Salt water, prolonged: sodium chloride can lodge in surface imperfections and along cleavage traces, dulling polish over time
Extended soaking: unnecessary.
Brief rinse achieves all cleansing purposes. Feldspar is slightly more cleavage-prone than quartz, so gentleness is warranted
Ultrasonic cleaners: the vibration can exploit existing cleavage planes in feldspar. Avoid
Better alternatives for regular cleansing: Sunlight (the ideal method for a sun stone, 15-30 minutes), sound vibration (2-3 minutes with singing bowl), sage or palo santo smoke (30-60 seconds), selenite plate (4-6 hours).
Can Sunstone Go in the Sun? Absolutely. This is a sun stone. The color comes from metallic copper or hematite platelets, not from organic dyes or light-sensitive compounds. These metallic inclusions are completely stable under solar exposure. Direct sunlight is the traditional and ideal charging method for sunstone. There is no time limit that matters for practical purposes, though 15-30 minutes of direct sun is sufficient for energetic charging.
Sunstone does not fade. It was made by fire and light, and it thrives in both.
Temperature
Natural Sunstone should usually feel cooler than plastic or resin on first touch and warm more slowly in the hand.
Scratch logic
Use 6 on the Mohs scale as the check, not internet myths. A real specimen should behave in line with the hardness listed above.
Surface and luster
Look for a vitreous to subvitreous surface quality rather than a painted or plastic shine.
Weight and density
The listed specific gravity is 2.62-2.65. If a specimen feels unusually light for its size, it may deserve a second look.
My Field Guide
Your private record and next steps
Journal
Add this stone to your private collection, then log what happened when you worked with it.
Shared Notes
Read public practice logs and pattern notes from the Crystalis community.
When members save a public field note for this stone, it will appear here.
Frequently Asked
Questions people ask about Sunstone
What does sunstone do?
Sunstone activates the sacral and solar plexus chakras, supporting joy, personal power, vitality, and leadership energy. In somatic practice, holding sunstone provides warm-spectrum light interaction and a grounding weight that the nervous system reads as safe activation. Documented across Norse, Greek, and Native American traditions as a stone of light, abundance, and sovereign strength.
Can sunstone go in water?
Yes. Sunstone is a feldspar mineral at Mohs 6-6.5 with no water-soluble components. Brief rinses of 30-60 seconds under cool running water are completely safe. Avoid prolonged salt water soaking and thermal shock.
Can sunstone go in the sun?
Yes, absolutely. Sunstone is a remarkably sun-stable crystal. Its color comes from metallic copper or hematite platelets, not organic dyes or light-sensitive compounds. Direct sunlight charging is the traditional and ideal method for this stone.
What is the difference between sunstone and goldstone?
Goldstone is man-made glass with embedded copper flecks, manufactured in Italy since the 17th century. Sunstone is a natural feldspar mineral. The quickest test: goldstone has perfectly uniform, evenly spaced sparkles. Sunstone has irregular, naturally distributed shimmer that shifts as you rotate the stone.
What chakra is sunstone?
Sacral chakra (Svadhisthana) and solar plexus chakra (Manipura). Sunstone bridges both: the creative vitality of the sacral center and the personal power of the solar plexus. This dual-chakra activation makes sunstone uniquely suited for leadership, creative confidence, and stepping into visibility.
What crystals pair well with sunstone?
Moonstone (sacred balance of solar and lunar energy), carnelian (double sacral activation for creativity), citrine (amplified solar plexus confidence), labradorite (light and transformation), and clear quartz (amplification of sunstone's radiance). Avoid pairing with heavy grounding stones if the goal is activation.
How can you tell if sunstone is real?
Five tests: (1) Aventurescence test: rotate the stone under light. Real sunstone shows irregular, shifting sparkle from natural copper or hematite platelets. Uniform sparkle suggests goldstone (glass). (2) Inclusion pattern: natural inclusions are irregularly distributed. (3) Temperature: real sunstone warms in the hand. Glass stays cooler. (4) Hardness: Mohs 6-6.5, scratches glass. (5) No air bubbles under magnification.
Where does sunstone come from?
Major sources include Oregon (USA), which produces the world's only copper-bearing gem-quality sunstone; Norway, the original European source; India, a major commercial producer; Tanzania and Madagascar for African varieties. Oregon sunstone with copper inclusions is the most valued variety globally.
Sources & Citations
Where this entry can be checked
Back Matter
Readable for people. Structured for AI search.
Sources stay visible in the page so readers, search engines, and answer systems can follow the evidence trail.
01
SCI
Cu nanoparticle geometry as the key to bicolor behavior in Oregon sunstones: An application of LSPR theory in nanomineralogy
Wang C., Shen A.H., Heaney P.J., Palke A., Wang K., Wang H., Kiefert L. (2025). Cu nanoparticle geometry as the key to bicolor behavior in Oregon sunstones: An application of LSPR theory in nanomineralogy. American Mineralogist. [SCI]DOI 10.2138/am-2023-9141
02
SCI
Iron oxide inclusions and exsolution textures of rainbow lattice sunstone
Jin S., Sun Z., Palke A.C. (2022). Iron oxide inclusions and exsolution textures of rainbow lattice sunstone. European Journal of Mineralogy. [SCI]DOI 10.5194/ejm-34-183-2022
03
HIST
Naturalis Historia, Book 37
Pliny the Elder. Naturalis Historia, Book 37. [HIST]
04
HIST
The Curious Lore of Precious Stones
Kunz, George Frederick. (1913). The Curious Lore of Precious Stones. [HIST]
05
LORE
On the trail of Vikings with polarized skylight: experimental study of the atmospheric optical prerequisites allowing polarimetric navigation by Viking seafarers
Gábor Horváth et al. (2011). On the trail of Vikings with polarized skylight: experimental study of the atmospheric optical prerequisites allowing polarimetric navigation by Viking seafarers. [LORE]DOI 10.1098/rstb.2010.0194
06
SCI
Light as a central modulator of circadian rhythms, sleep and affect
LeGates, T.A. et al. (2014). Light as a central modulator of circadian rhythms, sleep and affect. Nature Reviews Neuroscience. [SCI]DOI 10.1038/nrn3743
07
LORE
The sixteenth century Alderney crystal: a calcite as an efficient reference optical compass? Proceedings of the Royal Society A, 469(2153)
Le Floch, A. et al. (2013). The sixteenth century Alderney crystal: a calcite as an efficient reference optical compass? Proceedings of the Royal Society A, 469(2153). Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences. [LORE]DOI 10.1098/rspa.2012.0651
