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

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

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

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Tiger's Eye (Rough Slab) (Pseudomorph of Quartz after Crocidolite (SiO2 with Fe-containing inclusions)) — mineral

Tiger's Eye (Rough Slab)

Pseudomorph of Quartz after Crocidolite (SiO2 with Fe-containing inclusions)

Rose Quartz (Silicon dioxide (SiO2)) — mineral

Rose Quartz

Silicon dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Tiger's Eye (Rough) (Pseudomorph of Quartz after Crocidolite (SiO2)) — mineral

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2)

Turquoise (Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

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

Amethyst (Variety of Quartz)

Silicon Dioxide (SiO2) with iron impurities

Red Garnet (Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)) — mineral

Red Garnet

Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)

Red Jasper (Opaque Chalcedony) (Jasper / Silicon Dioxide (SiO2) with Ferric Iron inclusions) — mineral

Red Jasper (Opaque Chalcedony)

Jasper / Silicon Dioxide (SiO2) with Ferric Iron inclusions

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Black Tourmaline (Schorl) (Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)) — mineral

Black Tourmaline (Schorl)

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

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

Chalcedony (Quartz)

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine/Gold Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine/Gold Quartz)

Silicon Dioxide (SiO2)

Blue Chalcedony (Chalcedony (SiO2)) — mineral

Blue Chalcedony

Chalcedony (SiO2)

Blue Sapphire (Raw/Tumbled Corundum) (Corundum (Aluminum Oxide, Al2O3 with Fe/Ti traces)) — mineral

Blue Sapphire (Raw/Tumbled Corundum)

Corundum (Aluminum Oxide, Al2O3 with Fe/Ti traces)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Tiger's Eye (Titanium-containing Quartz (Silica: SiO2)) — Mineral

Tiger's Eye

Titanium-containing Quartz (Silica: SiO2)

Chrysoprase (Silicon Dioxide (Nickel-bearing Chalcedony) - SiO2) — mineral

Chrysoprase

Silicon Dioxide (Nickel-bearing Chalcedony) - SiO2

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

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Yellow Aventurine (specifically a carved crescent moon) (Silicon Dioxide (SiO2) with inclusions) — mineral

Yellow Aventurine (specifically a carved crescent moon)

Silicon Dioxide (SiO2) with inclusions

Jasper (Green Jasper/Heliotrope variety) (Silicon Dioxide (SiO2)) — sedimentary

Jasper (Green Jasper/Heliotrope variety)

Silicon Dioxide (SiO2)

Beryl (Aquamarine) (Beryllium aluminum silicate (Be3Al2Si6O18)) — mineral

Beryl (Aquamarine)

Beryllium aluminum silicate (Be3Al2Si6O18)

Hematite (Concretion) (Iron(III) oxide (Fe2O3)) — mineral

Hematite (Concretion)

Iron(III) oxide (Fe2O3)

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

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Druzy or Crystalline) (Silicon Dioxide (SiO2)) — mineral

Quartz (Druzy or Crystalline)

Silicon Dioxide (SiO2)

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

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Shale (Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)) — sedimentary

Shale

Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)

Quartzite (specifically Milky Quartz variety) (Quartz (SiO2)) — metamorphic

Quartzite (specifically Milky Quartz variety)

Quartz (SiO2)

Jasper (Picture Jasper variety) (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper (Picture Jasper variety)

Silicon Dioxide (SiO2) with impurities

Epidote (Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))) — mineral

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Green Tourmaline (Verdelite) (Elbaite (Complex Borosilicate: Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)) — mineral

Green Tourmaline (Verdelite)

Elbaite (Complex Borosilicate: Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)

Rough Green Tourmaline (Verdelite) (Elbaite (Complex Borosilicate), Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) — mineral

Rough Green Tourmaline (Verdelite)

Elbaite (Complex Borosilicate), Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Tiger's Eye (Silicon dioxide with crocidolite fibers (SiO2 with chrysotile amphibole inclusions)) — Mineral

Tiger's Eye

Silicon dioxide with crocidolite fibers (SiO2 with chrysotile amphibole inclusions)

Rose Quartz (Rose Quartz (SiO2)) — mineral

Rose Quartz

Rose Quartz (SiO2)

Amethyst (as part of a multi-stone bracelet) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst (as part of a multi-stone bracelet)

Silicon Dioxide (SiO2) with iron impurities

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

Labradorite

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

Blue Quartz (specifically Dumortierite Quartz) (Silicon Dioxide (SiO2) with inclusions of Dumortierite (Al7BO3(SiO4)3O3)) — metamorphic

Blue Quartz (specifically Dumortierite Quartz)

Silicon Dioxide (SiO2) with inclusions of Dumortierite (Al7BO3(SiO4)3O3)

Septarian Nodule (Dragon Stone) (Septarian Nodule (Calcium Carbonate/Aragonite/Calcite Concretion)) — sedimentary

Septarian Nodule (Dragon Stone)

Septarian Nodule (Calcium Carbonate/Aragonite/Calcite Concretion)