Rock Identifier

Category

Organic Gemstone (Not A Mineral)

Browse organic gemstone (not a mineral) specimens identified by the Rock Identifier community.

Learn about Organic Gemstone (Not A Mineral) in the encyclopedia

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Black Shale

Black Shale

Jet

Jet

Malachite

Malachite

Sapropel

Sapropel

Bituminous Shale

Bituminous Shale

Red Garnet

Red Garnet

Shungite

Shungite

Anatase

Anatase

Sperrylite

Sperrylite

Amber

Amber

Hutcheonite

Hutcheonite

Coal

Coal

Carnelian Agate (with Quartz/Chalcedony) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Carnelian Agate (with Quartz/Chalcedony)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

mineral
Olivine in Basalt (Peridot) (Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)) — igneous

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)

igneous
Blue Kyanite (Kyanite (Al2SiO5)) — metamorphic

Blue Kyanite

Kyanite (Al2SiO5)

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

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

mineral
Ruby (Raw/Rough) (Corundum (Al2O3 with Chromium trace)) — mineral

Ruby (Raw/Rough)

Corundum (Al2O3 with Chromium trace)

mineral
Epidosite (Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})) — metamorphic

Epidosite

Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})

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

Orthoclase Feldspar

Potassium Feldspar (KAlSi3O8)

mineral
Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

mineral
Aventurine (likely Green Aventurine) (Silicon Dioxide (SiO2) with mineral inclusions) — Mineral/Mineraloid within a rock matrix

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with mineral inclusions

Mineral/Mineraloid within a rock matrix
Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Agate (Silicon Dioxide (SiO2)) — mineral

Agate

Silicon Dioxide (SiO2)

mineral
Carnelian (SiO2 (Silicon Dioxide), a variety of Chalcedony) — mineral

Carnelian

SiO2 (Silicon Dioxide), a variety of Chalcedony

mineral
Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary
Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

mineral
Tiger's Eye (Pseudomorph of quartz after crocidolite (SiO2)) — metamorphic

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2)

metamorphic
Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

sedimentary
Nuummite (Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)) — metamorphic

Nuummite

Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)

metamorphic
Rough Ruby (Corundum (Al2O3 with Chromium impurities)) — mineral

Rough Ruby

Corundum (Al2O3 with Chromium impurities)

mineral
Obsidian (Volcanic glass (SiO2 - Silicon Dioxide with impurities)) — igneous

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

igneous
Amethyst Geode (Amethyst (SiO2 with iron impurities)) — mineral

Amethyst Geode

Amethyst (SiO2 with iron impurities)

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

Smoky Quartz

Quartz (Silicon Dioxide) - SiO2

mineral
Chalcedony (Quartz Var.) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Quartz Var.)

Silicon Dioxide (SiO2)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Falcon's Eye (Blue Tiger's Eye) (Pseudomorph of Quartz after Crocidolite (SiO2)) — metamorphic

Falcon's Eye (Blue Tiger's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2)

metamorphic
Obsidian (Volcanic glass (Mainly SiO2)) — igneous

Obsidian

Volcanic glass (Mainly SiO2)

igneous
Malachite (Copper carbonate hydroxide Cu2CO3(OH)2) — mineral

Malachite

Copper carbonate hydroxide Cu2CO3(OH)2

mineral
Agate (Silicon dioxide (SiO2)) — mineral

Agate

Silicon dioxide (SiO2)

mineral
Carnelian Agate (Chalcedony (SiO2) with iron oxide inclusions) — mineral

Carnelian Agate

Chalcedony (SiO2) with iron oxide inclusions

mineral
Sodalite (Sodalite (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

mineral
Red Jasper (Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)) — mineral

Red Jasper

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

mineral
Clear Quartz Crystal (Silicon dioxide (SiO2)) — mineral

Clear Quartz Crystal

Silicon dioxide (SiO2)

mineral
Zircon (Zircon (Zirconium Silicate - ZrSiO4)) — mineral

Zircon

Zircon (Zirconium Silicate - ZrSiO4)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Carnelian (Carnelian (Silica/Chalcedony, SiO2)) — mineral

Carnelian

Carnelian (Silica/Chalcedony, SiO2)

mineral
Heliotrope (Bloodstone) (Silicon dioxide (SiO2) with inclusions of Hematite or Chlorite) — Mineral

Heliotrope (Bloodstone)

Silicon dioxide (SiO2) with inclusions of Hematite or Chlorite

Mineral
Smoky Quartz (Smoky Quartz (SiO2)) — mineral

Smoky Quartz

Smoky Quartz (SiO2)

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

Citrine Quartz (Yellow Quartz)

Silicon Dioxide (SiO2) with iron impurities

mineral
Labradorite (Labradorite (a calcium-enriched feldspar mineral), (Ca, Na)(Al, Si)4O8) — mineral

Labradorite

Labradorite (a calcium-enriched feldspar mineral), (Ca, Na)(Al, Si)4O8

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral
Tiger's Eye (Pseudomorph of Crocidolite (SiO2 with iron oxides)) — mineral

Tiger's Eye

Pseudomorph of Crocidolite (SiO2 with iron oxides)

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

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

mineral
Blue Apatite (Apatite - Ca5(PO4)3(F,Cl,OH)) — mineral

Blue Apatite

Apatite - Ca5(PO4)3(F,Cl,OH)

mineral