Rock Identifier

Category

Organic Gemstone (Biogenic)

Browse organic gemstone (biogenic) specimens identified by the Rock Identifier community.

Learn about Organic Gemstone (Biogenic) in the encyclopedia

Jet

Pearls (Nacre, composed mainly of aragonite (CaCO₃) and conchiolin) — gemstone

Pearls

Nacre, composed mainly of aragonite (CaCO₃) and conchiolin

Pearl (Aragonite / Calcium Carbonate (CaCO3)) — mineral

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Black Freshwater Pearls (Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3) — mineral

Black Freshwater Pearls

Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3

Abalone Shell (Nacre) (Aragonite (CaCO3) - Biogenic Mineral) — mineral

Abalone Shell (Nacre)

Aragonite (CaCO3) - Biogenic Mineral

Fossilized Bone (Petrified Bone / Biogenic Sedimentary) — fossil

Fossilized Bone

Petrified Bone / Biogenic Sedimentary

Fossiliferous Limestone (Biogenic Sedimentary Rock) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock

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

Pearl (Biogenic Mineraloid)

Calcium carbonate (Aragonite) and Conchiolin, CaCO3

Ammolite (Biogenic gemstone (Aragonite, CaCO3)) — mineral

Ammolite

Biogenic gemstone (Aragonite, CaCO3)

Fossiliferous Limestone (Biogenic Limestone (CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Limestone (CaCO3)

Shell Cameo (Sardonyx Shell) (Cassis madagascariensis (Sardonyx shell)) — mineral (biogenic silica/calcium carbonate substrate)

Shell Cameo (Sardonyx Shell)

Cassis madagascariensis (Sardonyx shell)

mineral (biogenic silica/calcium carbonate substrate)

Chert (or Petrifed Wood / Banded Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (or Petrifed Wood / Banded Flint)

Silicon Dioxide (SiO2)

Chert (Flint) (Chert (SiO2)) — sedimentary

Chert (Flint)

Chert (SiO2)

Chert (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert

Cryptocrystalline Quartz (SiO2)

Fossilized Tooth Fragment (Vertebrate Fossil (Mammalia indet.)) — fossil

Fossilized Tooth Fragment

Vertebrate Fossil (Mammalia indet.)

Fossilized Shell Fragment / Mother of Pearl (Calcium Carbonate (CaCO3) - Aragonite/Calcite biomineral) — fossil

Fossilized Shell Fragment / Mother of Pearl

Calcium Carbonate (CaCO3) - Aragonite/Calcite biomineral

Coquina / Shelly Limestone (Coquina (Biogenic Limestone)) — sedimentary

Coquina / Shelly Limestone

Coquina (Biogenic Limestone)

Oyster Shell Fragment (Crassostrea virginica (or related Bivalvia)) — fossil

Oyster Shell Fragment

Crassostrea virginica (or related Bivalvia)

Pearl oyster shell with cultured pearls (Mollusk shell (likely Pinctada spp.) containing aragonite pearls, CaCO₃) — gemstone

Pearl oyster shell with cultured pearls

Mollusk shell (likely Pinctada spp.) containing aragonite pearls, CaCO₃

Pearl necklace (Pearl: biogenic calcium carbonate, primarily aragonite (CaCO₃), in a conchiolin matrix) — gemstone

Pearl necklace

Pearl: biogenic calcium carbonate, primarily aragonite (CaCO₃), in a conchiolin matrix

Fossiliferous Limestone (Biogenic Limestone (CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Limestone (CaCO3)

Fossiliferous Limestone (Coquina / Shell Limestone) (Biogenic Limestone (CaCO3)) — sedimentary

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (CaCO3)

Ammolite (Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)) — mineral

Ammolite

Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)

Mother of Pearl (Nacre) (Aragonite (layered with organic polymers), CaCO3) — mineral

Mother of Pearl (Nacre)

Aragonite (layered with organic polymers), CaCO3

Fossiliferous Limestone (Biogenic Sedimentary Rock (CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock (CaCO3)

Human Skin (Epidermis/Dermis) (Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)) — Mineral-like biological tissue

Human Skin (Epidermis/Dermis)

Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)

Mineral-like biological tissue

Pearl (Biogenic CaCO3 (Aragonite)) — mineral

Pearl

Biogenic CaCO3 (Aragonite)

Fossiliferous Limestone (Fossiliferous Calcite (CaCO3)) — sedimentary

Fossiliferous Limestone

Fossiliferous Calcite (CaCO3)

Pearl (Calcium carbonate (CaCO3) - Aragonite/Calcite variety) — mineral

Pearl

Calcium carbonate (CaCO3) - Aragonite/Calcite variety

Fossiliferous Limestone (Shell Fragment) (Biogenic Limestone (Calcium Carbonate / CaCO3)) — sedimentary

Fossiliferous Limestone (Shell Fragment)

Biogenic Limestone (Calcium Carbonate / CaCO3)

Mother of Pearl (Nacre) (Nacre (Aragonite/Conchiolin), CaCO3 + Organic Polymers) — mineral

Mother of Pearl (Nacre)

Nacre (Aragonite/Conchiolin), CaCO3 + Organic Polymers

Fossiliferous Limestone (Calcite (CaCO3) matrix with biogenic fragments) — sedimentary

Fossiliferous Limestone

Calcite (CaCO3) matrix with biogenic fragments

Pearl (Calcium Carbonate (Aragonite) - CaCO3) — mineral

Pearl

Calcium Carbonate (Aragonite) - CaCO3

Fossilized Tiger Shark Tooth (Galeocerdo cuvier (fossilized hydroxylapatite)) — sedimentary

Fossilized Tiger Shark Tooth

Galeocerdo cuvier (fossilized hydroxylapatite)

Fossiliferous Limestone (Fossiliferous Limestone (CaCO3)) — sedimentary

Fossiliferous Limestone

Fossiliferous Limestone (CaCO3)

Pearl (Aragonite (CaCO3) with Conchiolin) — mineral

Pearl

Aragonite (CaCO3) with Conchiolin

Fossiliferous Limestone (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous Limestone (Coquina / Shell Limestone) (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Limestone with Fossil inclusions (Fossiliferous Limestone (CaCO3)) — sedimentary

Limestone with Fossil inclusions

Fossiliferous Limestone (CaCO3)

Pearl (Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin) — mineraloid

Pearl

Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin

Fossiliferous Limestone (Biogenic Sedimentary Rock (primarily CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock (primarily CaCO3)

Pearl (Biogenic Gemstone) (Calcium Carbonate (Aragonite and Calcite) with Conchiolin) — gemstone

Pearl (Biogenic Gemstone)

Calcium Carbonate (Aragonite and Calcite) with Conchiolin

Pearl (Biogenic calcium carbonate; mainly aragonite (CaCO₃), sometimes calcite, in nacre) — gemstone

Pearl

Biogenic calcium carbonate; mainly aragonite (CaCO₃), sometimes calcite, in nacre