Rock Identifier

Category

Organic Gemstone

Browse organic gemstone specimens identified by the Rock Identifier community.

Learn about Organic Gemstone in the encyclopedia

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Jet

Jet

Sapropel

Sapropel

Red Garnet

Red Garnet

Bituminous Shale

Bituminous Shale

Black Shale

Black Shale

Petrified Wood

Petrified Wood

Amber

Amber

Peat

Peat

Oil Shale

Oil Shale

Pearl

Pearl

Lizard Skin Jasper

Lizard Skin Jasper

Rhodonite

Rhodonite

Citrine or Yellow Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine or Yellow Quartz

Silicon Dioxide (SiO2) with iron impurities

mineral
Amazonite (KAlSi3O8 (Potassium Aluminum Silicate)) — mineral

Amazonite

KAlSi3O8 (Potassium Aluminum Silicate)

mineral
Quartz (Agate/Chalcedony variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Agate/Chalcedony variety)

Silicon Dioxide (SiO2)

mineral
Quartz (Vein Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

mineral
Amazonite (K(AlSi3O8) - Microcline (Var. Amazonite)) — mineral

Amazonite

K(AlSi3O8) - Microcline (Var. Amazonite)

mineral
Prehnite (Prehnite (Ca2Al(AlSi3O10)(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

mineral
Quartz (Smoky/Milky variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

mineral
Botryoidal Chalcedony (Silicon Dioxide (SiO2)) — mineral

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

mineral
Potassium Feldspar (Orthoclase) (Orthoclase (KAlSi3O8)) — mineral

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

mineral
Labradorite ((Na, Ca)(Si, Al)4O8) — mineral

Labradorite

(Na, Ca)(Si, Al)4O8

mineral
Smoky Quartz (SiO2 (Silicon Dioxide)) — mineral

Smoky Quartz

SiO2 (Silicon Dioxide)

mineral
Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Ruby (varieties of Corundum) (Aluminum oxide (Al2O3) with Chromium traces) — mineral

Ruby (varieties of Corundum)

Aluminum oxide (Al2O3) with Chromium traces

mineral
Citrine (Silicon dioxide (SiO2)) — mineral

Citrine

Silicon dioxide (SiO2)

mineral
Yellow Quartz (Chalcedony/Citrine Pebble) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Chalcedony/Citrine Pebble)

Silicon Dioxide (SiO2)

mineral
Milky Quartz (Quartz (Silicon Dioxide - SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

mineral
Sodalite (Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

mineral
Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral
Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Milky Quartz with Iron Inclusions (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

mineral
Quartz (Smoky/Milky variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Milky variant)

Silicon Dioxide (SiO2)

mineral
Milky Quartz Pebble (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral
Smoky Quartz (Silicon Dioxide (SiO2) with aluminum impurities) — mineral

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

mineral
Yellow Agate (Silicon Dioxide (SiO2)) — mineral

Yellow Agate

Silicon Dioxide (SiO2)

mineral
Jasper (Silicon dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon dioxide (SiO2) with impurities

sedimentary
Milky Quartz (Quartz (Silicon Dioxide - SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

mineral
Quartz (Iron-Stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

mineral
Quartz (Smoky/Grey variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Grey variety)

Silicon Dioxide (SiO2)

mineral
Orange Quartz (Citrine Quartz) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Orange Quartz (Citrine Quartz)

Silicon Dioxide (SiO2) with iron impurities

mineral
Tektite (Indochinite) (Tektite (Lechatelierite-rich silica glass)) — Mineral-like (Natural Glass)

Tektite (Indochinite)

Tektite (Lechatelierite-rich silica glass)

Mineral-like (Natural Glass)
Sodalite (Sodalite, Na8(Al6Si6O24)Cl2) — mineral

Sodalite

Sodalite, Na8(Al6Si6O24)Cl2

mineral
Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Quartz Geode with Chalcedony (Crystalline Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode with Chalcedony

Crystalline Silicon Dioxide (SiO2)

sedimentary
Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Unakite (Unakite (Epidotized Granite)) — metamorphic

Unakite

Unakite (Epidotized Granite)

metamorphic
Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Feldspar (Orthoclase) (Potassium Alveolar Silicate (KAlSi3O8)) — mineral

Feldspar (Orthoclase)

Potassium Alveolar Silicate (KAlSi3O8)

mineral
Quartz (Smoky Quartz variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

mineral
Sunstone (Feldspar variety) (Plagioclase Feldspar (Na,Ca)(Al,Si)4O8) — mineral

Sunstone (Feldspar variety)

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

mineral
Quartz (Milky/Clear variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

mineral
Amethyst (Quartz variety) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst (Quartz variety)

Silicon Dioxide (SiO2) with iron impurities

mineral
Quartz (Milky or Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Iron-stained)

Silicon Dioxide (SiO2)

mineral