Crystalis Crystal Dictionary

Chevron Amethyst

The Layered Seer

You can feel the layers but cannot tell which one is running the show. Chevron amethyst alternates purple and white quartz in V-shaped bands, each layer a different episode of crystallization. Internal sorting does not have to mean choosing only one.

Intent

Intuition
Heart HealingSpiritual ConnectionClarity & Focus
Somatic note

Chevron amethyst is a Third Eye and Crown chakra stone whose alternating violet-white banding creates a rhythmic activation-amplification pattern in the upper energy...

Overview

The heart of the entry

Everything inside has gone layered and hard to read. Insight mixed with fear. Rest mixed with vigilance. The whole...

Mineralogy

Quartz

The V-shaped bands are not decorative. They are structural. Chevron amethyst forms when amethyst and white quartz...
Chevron Amethyst specimen

Formation

How it forms

Trigonal system — earth conditions, structure, and place.
ca₁a₂a₃120°Trigonal · Chevron Amethyst

Crystal system diagram represents the general trigonal classification. Diagram created by Crystalis for educational reference.

What your body knows

Intuition

Chevron amethyst is a Third Eye and Crown chakra stone whose alternating violet-white banding creates a rhythmic activation-amplification pattern in the upper energy...

The Meaning

Chevron Amethyst in the Crystalis dictionary

Everything inside has gone layered and hard to read. Insight mixed with fear. Rest mixed with vigilance. The whole inner field stacked too tightly.

Chevron amethyst shows its own sorting system.

White quartz and purple amethyst gather in V-shaped zones sharp enough to separate one register from another without pretending they were never connected.

Some minds can think again once contrast becomes visible.

Stone Lore

Stories carried through time

Cultural notes are presented as tradition and historical context — stories carried through time.

Ancient Greek Tradition (inherited)

The Banded Sobriety Stone

Chevron amethyst inherits the full weight of amethyst's Greek tradition -- amethystos ('not intoxicated'), wine goblets carved from amethyst, rings worn during symposia to maintain clarity. The naturally banded variety, with its V-shaped alternation of purple amethyst and white quartz, adds a visual dimension: the chevron pattern creates a visible rhythm of color and clarity, like the oscillation between states that the stone was meant to regulate.

Banded amethyst specimens were known to ancient lapidaries, though the specific term 'chevron amethyst' is modern.

c. 700 BCE onward

Historical note

The African Source

The most commercially significant deposits of chevron amethyst come from Zambia and neighboring countries in southern Africa, where hydrothermal quartz veins produce large volumes of banded material with vivid purple-white contrast and...

Zambia and Southern Africa, modern era

Origin lore

South American Chevron Amethyst

The Parana Basin basalts of southern Brazil and northern Uruguay, which produce the world's largest amethyst geodes, also yield chevron amethyst where growth conditions alternated between amethyst-producing and plain quartz-producing...

Brazil and Uruguay, ongoing

Ritual history

The Third Eye Amplifier

In the crystal healing tradition, chevron amethyst was specifically distinguished from standard amethyst for its perceived enhancement of third eye activation and dream work. Practitioners taught that the alternating amethyst-and-quartz...

Crystal Practice · 1970s-present

Earth Record

Mineralogy and formation

Variety of Quartz

The V-shaped bands are not decorative. They are structural. Chevron amethyst forms when amethyst and white quartz crystallize in alternating pulses inside hydrothermal veins, each episode depositing a layer at a slightly different angle. The result is a repeating zigzag visible in cross-section: purple-white-purple-white, with the boundaries between layers recording shifts in trace iron concentration, temperature, or fluid chemistry.

Same SiO2 as any quartz. Same trigonal system. The purple comes from Fe4+ produced by natural gamma radiation; the white layers lack sufficient iron or radiation exposure. Most commercial material comes from Brazil, India, Zambia, and Madagascar. Often polished into spheres or towers where the banding pattern becomes the whole visual identity.

ca₁a₂a₃120°Trigonal · Chevron Amethyst

Crystal system diagram represents the general trigonal classification. Diagram created by Crystalis for educational reference.

Trigonal structure

Chemical Formula
SiO2
Crystal System
Trigonal
Mohs Hardness
7
Specific Gravity
2.65
Luster
Vitreous
Color
Purple and white V-shaped banding
IMA Status
variety
IMA Number
IMA1967 s.p. (Quartz; Chevron Amethyst is a variety/trade name, not an IMA species) ([PubChem Quartz entry](https://pubchem.ncbi.nlm.nih.gov/compound/Quartz))
01

Mineral conditions gather

02

Structure begins to crystallize

03

Chevron Amethyst records place and pressure

IndiaBrazilZambiaRussia

Telling it apart

Regular amethyst is uniformly purple quartz. Chevron amethyst shows alternating V-shaped bands of purple amethyst and white quartz from oscillating growth conditions. The key energetic difference: regular amethyst calms and opens the crown.

Chevron amethyst calms, opens, and focuses. the quartz layers amplify the amethyst signal, creating a stronger third-eye activator. Choose amethyst for peace.

Spotting the real thing

V-Shaped Banding Pattern Genuine chevron amethyst displays alternating V-shaped (chevron) bands of purple and white when viewed in cross-section. The V-pattern follows the natural growth habit of quartz and should appear organic, slightly irregular, and three-dimensional. If the banding appears perfectly uniform, printed, or flat, question the specimen. Natural chevron patterns show subtle variation in band width, color intensity, and angle.

Color Consistency Within Bands In genuine chevron amethyst, the purple bands should show the natural characteristics of amethyst, slight color zoning, occasional lighter or darker areas within a single band, and the characteristic cool violet of iron-based color centers. Dyed material shows unnaturally uniform color that concentrates in fractures and grain boundaries rather than following crystallographic zones.

Hardness and Weight Chevron amethyst at Mohs 7 cannot be scratched by a steel knife and will scratch glass. It should feel noticeably heavier than glass or plastic imitations.

Energetic Associations

How people most often work with Chevron Amethyst

Intuition

A traditional association that gives Chevron Amethyst a clear intention pathway in practice.

Heart Healing

Used as a companion for slow repair, honest feeling, and gentleness around loss.

Spiritual Connection

A traditional association that gives Chevron Amethyst a clear intention pathway in practice.

Clarity & Focus

A traditional association that gives Chevron Amethyst a clear intention pathway in practice.

Primary pathway: Clarity & Focus

Clarity & FocusHeart HealingInner Peace

Charged & on alert

The Banded Haze

You cannot see the path. Not because there is no path, but because the fog has settled and your internal visibility is near zero. Decisions feel impossible not because the options are bad but because you cannot perceive them clearly enough to compare. Your dorsal vagal system has pulled a grey curtain across the third eye; a protective measure that once served you (during overwhelm, shutting down perception reduces stimulation) but has now become the problem itself.

Chevron amethyst enters this state like headlights cutting through mist. The amethyst layers gently reactivate the perceptual centers the nervous system shut down. The quartz layers amplify whatever signal emerges, making faint patterns visible. The stone does not force clarity. It restores the conditions under which clarity becomes possible. The fog does not lift all at once. First you see shapes.

Then edges. Then the path was there the whole time.

Shut down & far away

The Overthink Loop

Your mind will not stop. Every thought spawns three more. Every option generates twelve contingencies. You are not thinking clearly; you are thinking frantically, and the sheer volume of mental activity has become indistinguishable from productive analysis. Your sympathetic system is expressing its hypervigilance not through physical agitation but through cognitive overdrive. Chevron amethyst addresses this pattern by channeling the mental energy rather than suppressing it.

Amethyst calms the frequency. White quartz focuses the beam. The chevron pattern itself; V-shapes pointing inward; acts as a visual funnel, drawing scattered attention toward a single convergence point. The stone does not tell you to stop thinking. It organizes the thinking into layers, the way the stone itself is organized. Suddenly the signal emerges from the noise.

Settled & connected

The Dream Disconnect

You used to dream vividly. You used to have hunches that turned out to be right. You used to feel a sense of inner knowing about decisions, a quiet signal beneath the logic. That channel has gone silent. The oscillation between dorsal shutdown and sympathetic overdrive has severed the line between your conscious mind and your intuitive processing. You are operating on data alone, and it is not enough.

Chevron amethyst is the stone most specifically prescribed for restoring dream recall and intuitive function. Its dual-layer structure mirrors the relationship between conscious (quartz, clear, amplifying) and unconscious (amethyst, violet, receptive) processing. Placed under the pillow, it does not create dreams. It reopens the channel that allows you to remember them. And in waking life, it restores the subtle signal that your overstimulated nervous system has been drowning out.

Settled & connected

The Clear Seer

Your inner eye is open and your mind is quiet enough to use it. You see patterns in your life, in other people's behavior, in the trajectory of a decision. Not with anxiety; with clarity. Your ventral vagal system is online, and the integration between rational analysis and intuitive perception is functioning smoothly. You dream, you remember, you trust the data and the hunch equally.

Chevron amethyst in this state is not medicine. It is a tuning fork. The stone's layered structure resonates with your own layered awareness, reinforcing the clarity rather than creating it. You hold it during meditation and the signal gets sharper. You place it at the third eye and the internal image gets more vivid. You are not seeking vision. You are maintaining it. The clear seer uses chevron amethyst the way a musician uses a metronome; not because they cannot keep time, but because precision matters.

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 Chevron Amethyst

Hold

Carry Chevron Amethyst 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 Chevron Amethyst 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 Inner Arrow

The Inner Arrow Protocol

3 min protocol
  1. 1

    Third Eye Placement (30 seconds)Sit or recline comfortably. Place the chevron amethyst flat against the space between and slightly above your eyebrows -- the third eye point (Ajna center). If sitting, hold it in place with one finger. If reclining, let gravity hold it. Close your eyes. The stone is cool and dense at Mohs 7 -- heavier than it looks. Feel the weight against the frontal bone. This is a skull bone -- thin enough that temperature transfer is immediate. Let the coolness register. Do not visualize anything yet. Simply notice the sensation of something specific pressing gently against the seat of inner vision. Your attention will naturally gather at that point. Let it.

  2. 2

    The Chevron Breath (60 seconds)With the stone still at the third eye, begin a focused breathing pattern. Inhale through the nose for 4 counts -- as you inhale, imagine the breath traveling upward from the base of the spine to the third eye, following the path of a violet arrow. Exhale through the nose for 6 counts -- as you exhale, imagine the breath expanding outward from the third eye in a white wave, the way quartz amplifies what it receives. Four full cycles. Each inhale is amethyst: gathering, concentrating, directing. Each exhale is quartz: expanding, clarifying, amplifying. The breath mimics the stone's own layered structure -- reception and broadcast, reception and broadcast.

  3. 3

    The Pattern Scan (40 seconds)Remove the stone from the third eye and open your eyes. Hold the chevron amethyst at arm's length and find one V-shaped chevron band. Trace the V from one outer edge, down to the point, and up the other side. Slowly. One complete chevron traced. The V-shape is a natural convergence pattern -- it draws your visual attention to a focal point and then releases it outward. This is the shape of focus itself: scatter narrowing to insight, then insight expanding to understanding. As you trace, let one question you have been carrying rise to the surface. Not the answer. Just the question. Let the chevron hold it.

  4. 4

    Soft Gaze Reception (30 seconds)Without forcing anything, soften your gaze so the stone slightly blurs. This activates peripheral vision and switches the visual cortex from focused (sympathetic) to receptive (parasympathetic) mode. In this soft-focus state, the chevron bands may appear to shimmer or shift. This is an optical effect of defocused vision on a patterned surface -- and it is also the perceptual mode in which intuitive signals are most easily received. Hold the soft gaze for 30 seconds. If an image, word, feeling, or insight arises, note it without grasping. If nothing arises, that is also data. The channel is opening. It does not have to deliver on the first session.

  5. 5

    Nightstand Placement (20 seconds)Place the chevron amethyst on your nightstand, under your pillow, or within arm's reach of where you sleep. If the protocol was done at bedtime, this is the final step before sleep. If done during the day, the stone will be waiting for you at night. Chevron amethyst's strongest documented application is in dream work -- placed near the head during sleep, it supports vivid dreaming, dream recall, and over time, lucid dream development. The protocol during waking hours opens the channel. Sleep is when the signal comes through.

Stone Intelligence

The fact that makes Chevron Amethyst memorable

The chevron bands in your stone are a geological diary. Each purple layer records a period when iron-rich hydrothermal fluids flowed through volcanic rock and natural radiation turned the iron into a color center. Each white layer records a pause — a phase when conditions shifted and pure quartz crystallized without the iron signature. This alternation between reception and amplification is not metaphor.

It is what the stone literally does at the atomic level and what the practice invites your nervous system to do at the experiential level. Crystalis documents both because the crystal never separated them — the earth oscillated, the mineral recorded, and the pattern still has something to teach a mind that has forgotten how to receive.

SCI

Stratigraphy, structure and volcanology of the SE Deccan continental flood basalt province

Journal of the Geological Society · 2008Read source

SCI

Origin, spectral characteristics and practical applications of the cathodoluminescence of quartz

Mineralogy and Petrology · 2001Read source

HIST

Naturalis Historia (Natural History), Book 37

LORE

Green stone beads at the dawn of agriculture (PNAS)

2008

Ritual Use

From reference to practice

Chevron Amethyst in ritual practice

You are trying to see clearly through emotional interference. Chevron amethyst alternates bands of purple amethyst and white quartz in a V-pattern formed during sequential growth phases. Mohs 7.

The purple bands formed when iron-bearing silica was irradiated by gamma. The white bands formed when iron was absent. Hold it during sessions where insight needs to penetrate emotional static.

Each chevron is a complete cycle: clarity, then feeling, then clarity again. The pattern repeats because the crystal kept growing through alternating conditions.

Sacred Match

Sacred Match prescribes Chevron Amethyst when you report:

  • Mental fog that will not lift
  • Loss of dream recall or vivid dreaming
  • Overthinking that masquerades as analysis
  • Disconnection from intuition or inner knowing
  • Difficulty seeing patterns in your own life
  • Wanting to develop meditation or psychic practice
  • Feeling like you are operating on logic alone

Chevron amethyst finds you when the signal-to-noise ratio in your mind has inverted -- when you are producing more mental static than clear thought, or when the volume on your inner voice has dropped below threshold. The stone does not create intuition. It restores the bandwidth that chronic stress, overthinking, or shutdown has compressed. The amethyst layers reopen the channel. The quartz layers turn up the signal.

And the chevron pattern -- those geological arrows -- points your attention inward, toward the place where clarity has been waiting beneath the fog.

Take Sacred Match

Pairings Recipe File

Stones and herbs that harmonize with Chevron Amethyst

Crystalis crystal and herb pairing recipe box
Pairings are treated like a recipe file: clear use, method, and safety.

Crystal Companion

Chevron Amethyst + Amethyst

Use when
You want to layer the primary intention with another supportive tone.
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

Chevron Amethyst + Rhodonite

Use when
You want to layer the primary intention with another supportive tone.
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

Chevron Amethyst + Clear Quartz

Use when
You want to layer the primary intention with another supportive tone.
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

Chevron Amethyst + Black Tourmaline

Use when
You want to layer the primary intention with another supportive tone.
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.

Clear Quartz

Clear quartz amplifies everything it touches. Paired with chevron amethyst -- which already contains quartz amplifier layers -- this combination creates a doubled-signal effect for the third eye. Use when the inner vision channel is open but the signal is faint. Quartz does not add new information. It makes the existing information louder. This pairing is for people who can almost see the pattern but need more resolution.

Lapis Lazuli

Lapis lazuli is the truth stone -- it activates the throat and third eye with a demand for honest seeing. Paired with chevron amethyst's focused vision, this combination creates a powerful truth-seeking grid. Chevron amethyst opens the inner eye. Lapis demands that what it sees be real, not wishful. This pairing is for people who need to see their situation clearly, without the distortion of what they wish were true.

Moonstone

Moonstone works with the cycles of intuition -- the waxing and waning of inner knowing that follows its own lunar rhythm. Paired with chevron amethyst, it creates a dream work combination that is greater than either stone alone. Moonstone provides the emotional receptivity. Chevron amethyst provides the visual clarity. Together they produce dreams that are both vivid and emotionally meaningful -- not just strange imagery but usable insight.

Black Tourmaline

Black tourmaline provides root-chakra grounding and psychic protection. This pairing is essential for people doing intensive third-eye work with chevron amethyst. Opening the upper chakras without grounding the lower ones creates instability -- ungrounded visions, anxiety masquerading as intuition, spaciness instead of clarity. Black tourmaline anchors the root while chevron amethyst opens the crown. The vertical axis stays intact.

Labradorite

Labradorite is the stone of magic and synchronicity -- it opens perception to the extraordinary within the ordinary. Paired with chevron amethyst's focused inner vision, this combination is for people who want to see not just clearly but deeply. Labradorite adds the flash of unexpected insight. Chevron amethyst provides the steady gaze to hold that insight long enough to use it. This is the combination for pattern recognition at its most profound.

Care & Cleansing

How to keep Chevron Amethyst 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?

Use care

May fade or shift color in prolonged direct sun — keep exposure short and indirect.

Authenticity

What to check

Natural Chevron Amethyst should usually feel cooler than plastic or resin on first touch and warm more slowly in the hand.

The #1 Question Can Chevron Amethyst Go in Water? YES — WATER SAFE Chevron amethyst is safe for brief water contact. Chevron amethyst is a variety of quartz (SiO 2 ) with a Mohs hardness of 7. It is non-porous, chemically inert in water, and structurally sound. Water will not damage the crystal structure, dissolve any component, or affect the banding. Running water rinse: safe — brief rinse under cool running water for physical and energetic cleansing Short soaking (under 30 minutes): safe — will not affect the stone Prolonged soaking: avoid — can gradually dull polished surfaces over time Salt water: avoid — salt crystallization in micro-fractures can cause surface damage Hot water: avoid — thermal shock is unlikely at Mohs 7 but unnecessary risk for no benefit Gem water preparation: physically safe for direct infusion but indirect methods are preferred in practice One important note: while chevron amethyst is water safe, water is not its preferred element.

This is an air and ether stone — its energy responds to moonlight, sound, and breath. Water cleansing is adequate for physical cleaning but less resonant with the stone's third-eye frequency. Use moonlight or selenite for energetic resets.

Temperature

Natural Chevron Amethyst should usually feel cooler than plastic or resin on first touch and warm more slowly in the hand.

Scratch logic

Use 7 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 surface quality rather than a painted or plastic shine.

Weight and density

The listed specific gravity is 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

Crystalis field notebook with botanical sketches and rose quartz

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.

Open shared notes

Sacred Match

Find crystal, herb, and intention pairings that resonate with your season.

Find your match

Shop Chevron Amethyst

Explore intentionally selected pieces for ritual, emotional repair, and self-love work.

Shop collection

Community field notes

No shared notes under Chevron Amethyst yet.

When members save a public field note for this stone, it will appear here.

Frequently Asked

Questions people ask about Chevron Amethyst

What is chevron amethyst?

Chevron amethyst is a naturally banded variety of quartz (SiO2) displaying alternating V-shaped (chevron) layers of purple amethyst and white quartz. It forms when amethyst and milky quartz crystallize in sequential growth phases inside hydrothermal veins, creating a distinctive zigzag pattern. Mohs hardness 7. It works primarily with the third eye and crown chakras.

Can chevron amethyst go in water?

Yes. Chevron amethyst is water safe for brief cleansing. At Mohs 7, it is hard, non-porous, and chemically stable. Brief rinses and short soaks are safe. Avoid prolonged submersion and salt water. The stone is physically durable but should not be left in water for extended periods as this can dull the polish over time.

What is the difference between chevron amethyst and regular amethyst?

Regular amethyst is uniformly purple quartz colored by iron impurities and irradiation. Chevron amethyst displays alternating V-shaped bands of purple amethyst and white quartz, created by oscillating growth conditions during crystallization. Energetically, chevron amethyst combines amethyst's intuitive and calming properties with white quartz's amplification, creating a stronger third-eye activator than either component alone.

What chakra is chevron amethyst?

Chevron amethyst works primarily with the third eye chakra (intuition, inner vision, dream recall) and the crown chakra (spiritual connection, higher consciousness). The amethyst layers activate the upper chakras while the white quartz layers amplify and clarify the signal. This makes chevron amethyst one of the strongest third-eye stones in crystal practice.

What is chevron amethyst good for?

In crystal practice, chevron amethyst is valued for dream work and lucid dreaming, third eye activation, intuitive development, spiritual vision clarity, and meditation deepening. The combination of amethyst (intuition) and quartz (amplification) creates a stone that both opens the inner eye and sharpens what it sees.

Can chevron amethyst go in the sun?

Chevron amethyst will fade in prolonged direct sunlight. The purple color comes from iron impurities affected by natural irradiation — UV exposure reverses this process, gradually bleaching the violet tones. Brief sun exposure is fine, but never display or store chevron amethyst in direct sunlight. Moonlight is the preferred charging method.

Is chevron amethyst natural?

Yes. Chevron amethyst is entirely natural — the banding is created by oscillating growth conditions during crystallization, not by any human treatment. The V-shaped chevron pattern forms as crystal faces grow in alternating phases of amethyst-producing and quartz-producing conditions. It is not dyed, heated, or artificially layered.

How do you cleanse chevron amethyst?

Chevron amethyst can be cleansed with moonlight (preferred — overnight during full moon), selenite plate (4-8 hours), running water (brief rinse), smoke (sage or palo santo), or sound (singing bowl). Avoid direct sunlight for charging as it will fade the purple color. Moonlight is the ideal method for this stone.

Sources & Citations

Where this entry can be checked

Crystalis source notebook and citation desk

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.
  1. 01

    SCI

    Stratigraphy, structure and volcanology of the SE Deccan continental flood basalt province

    Jay, A.E. & Widdowson, M. (2008). Stratigraphy, structure and volcanology of the SE Deccan continental flood basalt province. Journal of the Geological Society. [SCI]DOI 10.1144/0016-76492006-062
  2. 02

    SCI

    Origin, spectral characteristics and practical applications of the cathodoluminescence of quartz

    Gotze, J., Plotze, M. & Habermann, D. (2001). Origin, spectral characteristics and practical applications of the cathodoluminescence of quartz. Mineralogy and Petrology. [SCI]DOI 10.1007/s007100170040
  3. 03

    HIST

    Naturalis Historia (Natural History), Book 37

    Pliny the Elder. Naturalis Historia (Natural History), Book 37. [HIST]
  4. 04

    LORE

    Green stone beads at the dawn of agriculture (PNAS)

    Daniella E. Bar-Yosef Mayer; N. Porat. (2008). Green stone beads at the dawn of agriculture (PNAS). [LORE]
  5. 05

    HIST

    The Curious Lore of Precious Stones

    Kunz, George Frederick. (1913). The Curious Lore of Precious Stones. [HIST]
  6. 06

    SCI

    Brazilian amethyst: review of mineralogy, geology, and gemology

    Liccardo, A. & Jordt-Evangelista, H. (2013). Brazilian amethyst: review of mineralogy, geology, and gemology. Brazilian Journal of Geology. [SCI]DOI 10.5327/Z2317-48892013000200002
  7. 07

    SCI

    Observation and origin of self-organized textures in agates

    Heaney, P.J. & Davis, A.M. (1995). Observation and origin of self-organized textures in agates. Science. [SCI]DOI 10.1126/science.269.5230.1562