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

Jet

Malachite

Sapropel

Bituminous Shale

Bituminous Shale

Red Garnet

Shungite

Anatase

Sperrylite

Petrified Wood

Amber

Hutcheonite

Lapis Lazuli (Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)) — metamorphic

Lapis Lazuli

Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)

Pyrite-bearing sulfide specimen (Pyrite (FeS₂), possibly with chalcopyrite (CuFeS₂) and/or marcasite) — mineral

Pyrite-bearing sulfide specimen

Pyrite (FeS₂), possibly with chalcopyrite (CuFeS₂) and/or marcasite

Fossilized Bone (Petrified Bone / Biogenic Sedimentary) — fossil

Fossilized Bone

Petrified Bone / Biogenic Sedimentary

Freshwater Pearl (Calcium Carbonate (CaCO3) in the form of Aragonite and Calcite) — gemstone

Freshwater Pearl

Calcium Carbonate (CaCO3) in the form of Aragonite and Calcite

Chert / Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Chert / Jasper

Microcrystalline Quartz (SiO2)

Polished fossiliferous limestone (Bioclastic carbonate rock, primarily calcite (CaCO₃)) — sedimentary

Polished fossiliferous limestone

Bioclastic carbonate rock, primarily calcite (CaCO₃)

Petrified Wood (Silicified wood (principally SiO2)) — sedimentary

Petrified Wood

Silicified wood (principally SiO2)

Pearl (Biogenic Mineraloid) (Calcium carbonate (Aragonite) and Conchiolin, CaCO3) — mineral

Pearl (Biogenic Mineraloid)

Calcium carbonate (Aragonite) and Conchiolin, CaCO3

Iridescent bismuth crystal (Bismuth (Bi), artificially crystallized and likely oxidized/coated) — mineral

Iridescent bismuth crystal

Bismuth (Bi), artificially crystallized and likely oxidized/coated

Bauxite (Bauxite (Al(OH)3, AlO(OH))) — sedimentary

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Chert (often called Jasper or Flint) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (often called Jasper or Flint)

Microcrystalline Silica (SiO2)

Chert (Jasper/Flint variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Natural freshwater pearls (Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)) — gemstone

Natural freshwater pearls

Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)

Chert (White-Tan variety) (Silicon dioxide (SiO2) / Microcrystalline Quartz) — sedimentary

Chert (White-Tan variety)

Silicon dioxide (SiO2) / Microcrystalline Quartz

Chert (Flint) (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Anthracite Coal (Anthracite (a variety of coal, predominantly carbon)) — Sedimentary Rock (Metamorphosed)

Anthracite Coal

Anthracite (a variety of coal, predominantly carbon)

Sedimentary Rock (Metamorphosed)

Amber (Succinite (specific to Baltic amber), fossilized tree resin) — Organic Mineraloid

Amber

Succinite (specific to Baltic amber), fossilized tree resin

Organic Mineraloid

Jasper (Red-Brown) (Silicon Dioxide (SiO2) with Iron Oxide impurities) — sedimentary

Jasper (Red-Brown)

Silicon Dioxide (SiO2) with Iron Oxide impurities

Amber (Succinate (Fossilized Tree Resin)) — mineraloid

Amber

Succinate (Fossilized Tree Resin)

Amber (Succinite) — Mineraloid

Amber

Succinite

Tumbled Obsidian (possibly Mahogany Obsidian variant) (Volcanic Glass (Amorphous Silicon Dioxide, SiO2)) — igneous

Tumbled Obsidian (possibly Mahogany Obsidian variant)

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Fossilized Bone (Vertebrate fossil (mineralized bone)) — fossil

Fossilized Bone

Vertebrate fossil (mineralized bone)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Chert (Jasper variation) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Amber (Succinite (with empirical formula approximately C10H16O)) — Organic Mineraloid

Amber

Succinite (with empirical formula approximately C10H16O)

Organic Mineraloid

Tumbled amber (likely) (Amber; fossilized plant resin, commonly succinite (organic material rather than a mineral)) — gemstone

Tumbled amber (likely)

Amber; fossilized plant resin, commonly succinite (organic material rather than a mineral)

Carnelian (Orange Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Carnelian (Orange Chalcedony)

Silicon Dioxide (SiO2)

Chert (Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper)

Silicon Dioxide (SiO2)

Likely bituminous coal (Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image) — sedimentary

Likely bituminous coal

Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image

Pyrite-bearing sulfide ore (likely pyrite with iron oxides) (Pyrite, FeS₂, possibly mixed with limonite/goethite and other sulfides) — mineral

Pyrite-bearing sulfide ore (likely pyrite with iron oxides)

Pyrite, FeS₂, possibly mixed with limonite/goethite and other sulfides

Amber (Succinates (Organic compound: C10H16O)) — mineraloid

Amber

Succinates (Organic compound: C10H16O)

Amber (Succinite (fossilized tree resin)) — fossil

Amber

Succinite (fossilized tree resin)

Baltic Amber (Succinite (Fossilized Resin)) — fossil

Baltic Amber

Succinite (Fossilized Resin)

Precious Coral (Corallium rubrum (Calcium carbonate with trace carotene)) — Organic gemstone / Sedimentary mineraloid

Precious Coral

Corallium rubrum (Calcium carbonate with trace carotene)

Organic gemstone / Sedimentary mineraloid

Amber (Succinite) — Organic mineraloid

Amber

Succinite

Organic mineraloid

Chert (Jasper/Flint variety) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Pearl (Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)) — mineral

Pearl

Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)

Amber (Succinite (C10H16O)) — gemstone

Amber

Succinite (C10H16O)

Polished operculum (“Shiva eye” shell) (Calcium-carbonate shell operculum, commonly from a turban snail (family Turbinidae); not a mineral specimen) — fossil

Polished operculum (“Shiva eye” shell)

Calcium-carbonate shell operculum, commonly from a turban snail (family Turbinidae); not a mineral specimen

Green Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Green Jasper

Silicon Dioxide (SiO2) with impurities

Natural or Cultured Pearl (Calcium Carbonate (Aragonite and Conchiolin), CaCO3) — Mineral (Organic)

Natural or Cultured Pearl

Calcium Carbonate (Aragonite and Conchiolin), CaCO3

Mineral (Organic)

Honey calcite (yellow calcite) (Calcite, calcium carbonate (CaCO₃)) — mineral

Honey calcite (yellow calcite)

Calcite, calcium carbonate (CaCO₃)