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Mohs
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18 material records. One readable index.

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18 records

  1. № 01 · The Anchor

    Gold Sheen Obsidian

    Composition
    Silica-rich natural volcanic glass; exact chemistry varies by source.
    Mohs
    5–5.5
    Formation
    Silica-rich melt solidified as glass before extensive crystallisation. Dense obsidian may cool slowly enough for residual bubbles to resorb while remaining fast relative to crystal nucleation.
    Age
    No single age applies at stone-type level; age belongs to a specific lava flow.
    Image
    BE. Studio geological reference visual.

    01 · Confirmed geology. Gold Sheen Obsidian is silica-rich volcanic glass whose oriented internal structures reflect light to produce an angle-dependent gold sheen. Published studies report more than one possible microstructure; this record does not assign one inclusion mineral without specimen analysis.

    02 · BE. selection. BE. looks for a continuous black field, restrained internal sheen that moves with angle, polish continuity and no surface-gold illusion. Product-specific records belong on the corresponding product page.

    03 · Geological Reading. Not every form comes from continued growth. The obsidian glass body forms within a cooling window: slow enough for remnant bubbles to resorb, yet still fast relative to extensive crystal nucleation. It becomes natural glass without continuing into a crystal-rich structure. BE. reads this history as a boundary reached without further accumulation: decisiveness is not haste, but crossing a material threshold before another structure takes hold. Gold appears only when light and angle align; depth comes from the black body, not constant shine.

    Sources. Nature Communications 2026 · GIA 2025 review

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  2. № 02 · The Void

    Amethyst

    Composition
    SiO₂
    Mohs
    7
    Formation or deposit
    Purple macrocrystalline quartz whose colour is held by iron-related centres activated through irradiation. No single age applies at stone-type level; age belongs to a specific deposit.
    Image
    Stone-type reference

    01 · Geological facts. Amethyst is purple quartz (SiO₂) whose iron-related colour centres absorb visible light after activation by irradiation.

    02 · BE. selection. Dimensional violet, readable zoning and translucency, strand continuity and surface integrity.

    03 · Geological Reading. Experience does not become wisdom automatically.

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  3. № 03 · The Prism

    Citrine

    Composition
    SiO₂
    Mohs
    7
    Formation or deposit
    Yellow-to-brownish-orange macrocrystalline quartz with iron-related colour and more than one possible colour history. No single age applies at stone-type level; age belongs to a specific deposit.
    Image
    Stone-type reference

    01 · Geological facts. Citrine is yellow to brownish-orange quartz (SiO₂), and its colour can develop through geological processes or heat treatment.

    02 · BE. selection. Luminous yellow, readable transparency, strand continuity and surface integrity.

    03 · Geological Reading. Visibility often comes after formation.

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  4. № 04 · The Flow

    Prehnite

    Composition
    Ca₂Al₂Si₃O₁₀(OH)₂
    Mohs
    6–6.5
    Formation or deposit
    Low-temperature alteration and low-grade metamorphic mineral that can occupy veins, fractures, vesicles and cavities. No single age applies at stone-type level; age belongs to a specific host and alteration or metamorphic event.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Prehnite is a calcium aluminium silicate hydroxide that forms during low-temperature alteration or low-grade metamorphism and can fill rock cavities.

    02 · BE. selection. Translucent body, visible internal structure and no waxy visual closure.

    03 · Geological Reading. Change can make room without deciding the final form.

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  5. № 05 · The Anchor

    Smoky Quartz

    Composition
    SiO₂
    Mohs
    7
    Formation or deposit
    Brown-to-grey quartz whose smoky appearance comes from irradiation-related colour centres in the crystal. No single age applies at stone-type level; age belongs to a specific deposit.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Smoky Quartz is quartz (SiO₂) whose brown to grey colour develops when irradiation creates colour centres associated with aluminium in its crystal structure.

    02 · BE. selection. Smoky depth with remaining translucency and tonal continuity.

    03 · Geological Reading. Depth does not have to cancel clarity.

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  6. № 06 · The Flow

    Rose Quartz

    Composition
    SiO₂
    Mohs
    7
    Formation or deposit
    Common massive rose quartz contains microscopic aligned silicate-mineral fibres associated with its pink colour and cloudy translucence. No single age applies at stone-type level; age belongs to a specific deposit.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Common massive Rose Quartz is quartz (SiO₂) whose microscopic silicate-mineral fibres contribute to its pink colour and cloudy translucence.

    02 · BE. selection. Pink remains distributed through a translucent body with readable internal depth and no flat surface-colour effect.

    03 · Geological Reading. Softness can be structural.

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  7. № 07 · The Flow

    Clear Quartz

    Composition
    SiO₂
    Mohs
    7
    Formation or deposit
    Colourless macrocrystalline quartz whose ordered structure can transmit visible light without a dominant colour-producing absorption. No single age applies at stone-type level; age belongs to a specific deposit.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Clear Quartz is colourless crystalline silica (SiO₂) that can contain fluid or mineral inclusions within its transparent to translucent body.

    02 · BE. selection. Transparency and internal structure remain legible together; clarity is not treated as chemical emptiness.

    03 · Geological Reading. Clarity is not emptiness.

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  8. № 08 · The Prism

    Hematoid Quartz

    Composition
    SiO₂ quartz host + iron-rich inclusion phase(s); exact identity specimen-dependent
    Mohs
    7
    Formation or deposit
    Quartz holding iron-rich colour and inclusions inside a clear host; exact phases vary by specimen. No single age applies at stone-type level; age depends on the documented quartz occurrence and inclusion event.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Hematoid Quartz is quartz (SiO₂) containing iron-rich inclusions whose mineral composition varies between specimens.

    02 · BE. selection. Readable iron distribution, retained quartz depth and disclosed variation.

    03 · Geological Reading. Intensity is not direction.

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  9. № 09 · The Flow

    Emerald Phantom Quartz

    Composition
    SiO₂ quartz host + CaF₂ fluorite inclusions
    Mohs
    7 for quartz host; 4 for fluorite
    Formation or deposit
    Quartz containing apple-green fluorite crystals distributed along a phantom plane; Emerald Phantom Quartz is the retained commercial name. No single stone-type age; age depends on the documented occurrence and growth events.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Emerald Phantom Quartz is the commercial name used here for quartz (SiO₂) containing fluorite crystals (CaF₂) along an internal growth plane.

    02 · BE. selection. A clear host, visible fluorite, coherent phantom-plane geometry and enough matched usable material.

    03 · Geological Reading. Continuation does not require erasure.

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  10. № 10 · The Prism

    Green Phantom Quartz

    Composition
    SiO₂ + inclusions
    Mohs
    7
    Formation or deposit
    An internal green growth boundary held inside later quartz. No single age applies at stone-type level; age depends on the host occurrence and growth events.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Green Phantom Quartz is quartz (SiO₂) whose green inclusions mark earlier crystal growth surfaces enclosed by later quartz.

    02 · BE. selection. Internal structure must read in depth and remain distinct from surface staining.

    03 · Geological Reading. Formation leaves readable evidence.

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  11. № 11 · The Flow

    Aquamarine

    Composition
    Be₃Al₂Si₆O₁₈
    Mohs
    7.5–8
    Formation or deposit
    Iron-related blue to green-blue beryl that can remain transparent. No single stone-type age; varies by deposit.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Aquamarine is blue to green-blue beryl (Be₃Al₂Si₆O₁₈) whose colour comes from iron-related absorption within the crystal.

    02 · BE. selection. A readable colour field, transmitted light, coherent matching and evidence kept separate from appearance.

    03 · Geological Reading. Colour can remain clear.

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  12. № 12 · The Flow

    Moonstone

    Composition
    Feldspar · exact species/intergrowth specimen-dependent
    Mohs
    6–6.5
    Formation or deposit
    In classic moonstone, cooling separates intergrown feldspars into fine alternating layers that scatter light. No single stone-type age; varies by host and deposit.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Classic Moonstone consists of intergrown orthoclase and albite feldspars whose fine internal layers scatter light to produce adularescence.

    02 · BE. selection. A mobile inner light, readable depth, coherent body and surface/build integrity.

    03 · Geological Reading. Light can come from depth.

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  13. № 13 · The Prism

    Golden Rutilated Quartz

    Composition
    SiO₂ host + TiO₂ rutile when confirmed
    Mohs
    7 for quartz host
    Formation or deposit
    Quartz encloses or intergrows with golden rutile while both minerals remain distinct. No single subtype-wide age; varies by deposit.
    Image status
    BE. Studio geological reference visual; full credit appears in the Stone Record

    01 · Geological facts. Golden Rutilated Quartz contains golden rutile crystals (TiO₂) enclosed in a quartz host (SiO₂), with the two minerals retaining distinct structures.

    02 · BE. selection. Keep the quartz body open around spatially legible lines; confirm inclusion identity separately.

    03 · Geological Reading. Coexistence does not require sameness.

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  14. № 14 · The Prism

    Green Rutilated Quartz

    Composition
    SiO₂ quartz host + actinolite-family needle inclusions
    Mohs
    7 for quartz host
    Formation or deposit
    Green Rutilated Quartz is the retained commercial name for quartz with actinolite-family needle inclusions. No single subtype-wide age; depends on inclusion, host and deposit.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Green Rutilated Quartz is the commercial name used here for quartz (SiO₂) with actinolite-family amphibole needles identified in the source records.

    02 · BE. selection. Publish visible structure and tested mineral identity as separate facts.

    03 · Geological Reading. A name should follow the material.

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  15. № 15 · The Void

    Blue Smoky Quartz

    Composition
    SiO₂ quartz-family material; blue mechanism unassigned
    Mohs
    7 for the quartz framework
    Formation or deposit
    Quartz carrying a smoky field and a blue appearance, recorded with its two optical questions kept separate. No single stone-type age; product locality and source required.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Blue Smoky Quartz is a commercial quartz-family material with a silica (SiO₂) framework and visually distinct smoky and blue appearances. Smoky colour centres and several distinct blue-quartz mechanisms are documented in authoritative studies; the mechanism of the current BE. lot remains unassigned.

    02 · BE. selection. The blue appearance and smoky field remain visually distinguishable across the strand; this is an editorial observation, not a mechanism diagnosis. Color and internal features form a readable sequence rather than being concealed by severe clouding, surface residue or mismatched beads. Inspect fractures, cavities, drill edges, chips and any evidence of filling or stabilization; uncertain features are escalated rather than renamed. No bead is accepted as proof of a named inclusion, locality, age or treatment without the corresponding product-level record or analysis.

    03 · Geological Reading. What gathers can become visible before each part can be seen.

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  16. № 16 · The Void

    Super Seven Quartz

    Composition
    SiO₂ quartz host + specimen-dependent zones and inclusions
    Mohs
    7 for the quartz framework
    Formation or deposit
    Included, color-zoned quartz recorded as a sequence of growth events rather than a fixed seven-part recipe. No single stone-type age; product locality and source required.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Super Seven Quartz is a commercial name for quartz (SiO₂) that can preserve colour zones and solid or fluid inclusions from its growth history. A fixed seven-mineral composition is not assigned at stone-type level.

    02 · BE. selection. Colorless, smoky or amethystine areas are read as a coherent spatial record where present; none is required merely to satisfy the commercial name. Included features should remain visually legible without being assigned a mineral identity from color or habit alone. Inspect fractures, cavities, drill edges, chips and possible filling or stabilization; dense inclusions do not excuse compromised construction. No specimen is described as containing seven components unless a product-specific analytical record identifies the claimed phases and explains the counting method.

    03 · Geological Reading. A record, not a recipe.

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  17. № 17 · The Void

    Kyanite

    Composition
    Al₂SiO₅
    Mohs
    5.5 parallel to [001]; 7 parallel to [100]
    Formation or deposit
    A triclinic Al₂SiO₅ polymorph whose hardness changes with crystallographic direction and whose bladed structure carries pronounced cleavage. No single stone-type age; product locality and source required.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Kyanite is a triclinic aluminium silicate (Al₂SiO₅) that occurs in metamorphic rocks and has hardness that varies with crystallographic direction.

    02 · BE. selection. Blade, grain, colour distribution or internal structure should remain visually legible without treating every line as damage. Edges, drill paths, surface-reaching separations and mounting pressure require close inspection because hardness alone does not describe resistance to splitting. Hue and light transmission should form an intentional sequence; blue is common but is not by itself proof of species, locality or treatment. Size, origin, treatment, construction and durability guidance belong to the verified product record, not to inference from the stone-type profile.

    03 · Geological Reading. Wholeness does not require equal resistance in every direction.

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  18. № 18 · The Anchor

    Almandine Garnet

    Composition
    Fe²⁺₃Al₂(SiO₄)₃ ideal end member; natural solid solution varies
    Mohs
    7–7.5
    Formation or deposit
    An isometric iron(II)-aluminium garnet with ideal formula Fe²⁺₃Al₂(SiO₄)₃, widespread in metamorphic rocks and also present in some igneous and sedimentary settings. No single stone-type age; product locality and source required.
    Image status
    Stone-type reference; full credit appears in the Stone Record

    01 · Geological facts. Almandine Garnet is an iron-aluminium garnet with ideal composition Fe₃Al₂(SiO₄)₃ that commonly forms in metamorphic rocks and crystallises in the cubic system.

    02 · BE. selection. Deep red or brown-red appearance alone is insufficient for an almandine claim; product-level identity requires adequate supplier, analytical or gemological evidence. Where translucency is part of the design, light should reveal internal depth rather than reducing the object to an opaque dark field. Hue, transparency, size and visual weight should form an intentional progression; natural variation is disclosed rather than digitally standardised. Polish, pits, fractures, drill edges and inclusions are reviewed at object level without treating every natural feature as a defect or proof of origin.

    03 · Geological Reading. Conditions can be carried as structure, not displayed as a story.

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Geological Codex FAQ

What is the BE. Geological Codex?

The BE. Geological Codex is a reference directory of stone types. Each record brings together geological facts, BE. selection criteria, a Geological Reading and source references.

How many stones are in the Geological Codex?

The Geological Codex contains 18 stone-type records, including quartz varieties, volcanic glass, feldspar, beryl and garnet.

Where do the Geological Codex images come from?

The Codex uses BE. Studio geological reference visuals and credited reference photographs. Image credits in each record identify the studio or the photographer, source and licence where listed.

How does a Codex record relate to a Stone Origin Record?

A Codex record describes a stone type. A Stone Origin Record documents the corresponding product or lot, including its recorded origin and treatment information.

BE.Back to directory
Text Index Stone Finder

01 · Geological facts

02 · BE. selection standard

03 · Geological Reading

Reference imagery describes a mineral type, not a BE. lot or origin. Final records must preserve author, source and licence, and separate verified facts from lot-dependent claims.
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01

Anchor

Chosen weight.

02

Flow

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03

Prism

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04

Void

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