Rock Identifier

Category

Sedimentary (Biogenic)

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

Learn about Sedimentary (Biogenic) in the encyclopedia

Conglomerate

Quartzite Sandstone

Quartzite Sandstone

Breccia

Ironstone

Diatomite

Coal

Kambaba Jasper

Limestone

Asphalt Rock

Claystone

Mudstone

Sapropel

Flint (chert), likely brown flint (Microcrystalline quartz/chalcedony (SiO₂)) — sedimentary

Flint (chert), likely brown flint

Microcrystalline quartz/chalcedony (SiO₂)

Pearl (Pearl; primarily aragonite (CaCO₃) with conchiolin) — gemstone

Pearl

Pearl; primarily aragonite (CaCO₃) with conchiolin

Pearl (Organic Mineral (CaCO3 with conchiolin)) — mineral

Pearl

Organic Mineral (CaCO3 with conchiolin)

Mixed Gemstone Collection (SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)) — mineral

Mixed Gemstone Collection

SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)

Fighting Conch (Sea Shell) (Strombus alatus (primarily composed of Calcium Carbonate / CaCO3)) — mineral

Fighting Conch (Sea Shell)

Strombus alatus (primarily composed of Calcium Carbonate / CaCO3)

Pearl (likely Freshwater or Akoya Cultured) (Aragonite / Conchiolin composite (CaCO3)) — Mineralloid (Organic gemstone)

Pearl (likely Freshwater or Akoya Cultured)

Aragonite / Conchiolin composite (CaCO3)

Mineralloid (Organic gemstone)

Pearl necklace (Pearl—biogenic calcium carbonate, primarily aragonite (CaCO₃)) — gemstone

Pearl necklace

Pearl—biogenic calcium carbonate, primarily aragonite (CaCO₃)

Pearl (Calcium Carbonate (CaCO3)) — mineral

Pearl

Calcium Carbonate (CaCO3)

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

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Pearl (Aragonite (CaCO3 with conchiolin)) — mineral

Pearl

Aragonite (CaCO3 with conchiolin)

Rounded brown chert or jasper pebble (Microcrystalline quartz (SiO₂), likely ferruginous chert/jasper) — sedimentary

Rounded brown chert or jasper pebble

Microcrystalline quartz (SiO₂), likely ferruginous chert/jasper

Spiny Oyster Shell (Spondylus varians (Biogenic Calcium Carbonate)) — mineral

Spiny Oyster Shell

Spondylus varians (Biogenic Calcium Carbonate)

Chert (or Flint) (Chert (cryptocrystalline quartz), SiO2) — Sedimentary

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Pearl necklace with small blue-green gemstone accents (Pearls: nacre, chiefly aragonite (CaCO₃) and conchiolin; accents appear to be turquoise or similar opaque blue-green stone) — gemstone

Pearl necklace with small blue-green gemstone accents

Pearls: nacre, chiefly aragonite (CaCO₃) and conchiolin; accents appear to be turquoise or similar opaque blue-green stone

Pearl (as a biogenic mineral/gemstone) (Calcium Carbonate (mostly Aragonite), CaCO3) — mineral

Pearl (as a biogenic mineral/gemstone)

Calcium Carbonate (mostly Aragonite), CaCO3

Red coral beads (Precious coral, commonly Corallium rubrum (calcium-carbonate skeleton)) — gemstone

Red coral beads

Precious coral, commonly Corallium rubrum (calcium-carbonate skeleton)

Pearl stud earrings (Pearl, primarily aragonite (CaCO₃) and conchiolin) — gemstone

Pearl stud earrings

Pearl, primarily aragonite (CaCO₃) and conchiolin

Wampum / Quahog Shell Fossil Fragment (Mercenaria mercenaria (Calcium carbonate, CaCO3)) — fossil

Wampum / Quahog Shell Fossil Fragment

Mercenaria mercenaria (Calcium carbonate, CaCO3)

Black Pearl (Tahitian Style) (Calcium Carbonate (Aragonite) - CaCO3 with Conchiolin) — mineral

Black Pearl (Tahitian Style)

Calcium Carbonate (Aragonite) - CaCO3 with Conchiolin

Red Coral (with Hematite and Black Pearl accents) (Corallium rubrum (Calcium Carbonate, CaCO3)) — mineral

Red Coral (with Hematite and Black Pearl accents)

Corallium rubrum (Calcium Carbonate, CaCO3)

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

Pearl (Cultured Freshwater)

Calcium Carbonate (Aragonite) - CaCO3

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

Pearl

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

Sea Shell Fragment (Calcium Carbonate) (Aragonite / Calcite (CaCO3)) — fossil

Sea Shell Fragment (Calcium Carbonate)

Aragonite / Calcite (CaCO3)

Fossilized shell or bone fragment (Indeterminate biogenic calcite or apatite fossil) — fossil

Fossilized shell or bone fragment

Indeterminate biogenic calcite or apatite fossil

Kidney Stone (Urolith) (Calculus renalis (Biogenic mineral aggregate)) — mineral

Kidney Stone (Urolith)

Calculus renalis (Biogenic mineral aggregate)

Abalone Shell (Mother of Pearl) (Aragonite (Biogenic Calcium Carbonate, CaCO3)) — mineral

Abalone Shell (Mother of Pearl)

Aragonite (Biogenic Calcium Carbonate, CaCO3)

Pearl (Organic Mineraloid (CaCO3 + Conchiolin)) — mineral

Pearl

Organic Mineraloid (CaCO3 + Conchiolin)

Pearl (Aragonite and Conchiolin (CaCO3 + organic protein)) — mineraloid

Pearl

Aragonite and Conchiolin (CaCO3 + organic protein)

Polished chert or jasper pebble (Microcrystalline quartz (SiO₂), likely chalcedony-rich chert/jasper) — sedimentary

Polished chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chalcedony-rich chert/jasper

Pearl (Calcium Carbonate (CaCO3) - Aragonite/Calcite organic gemstone) — mineral

Pearl

Calcium Carbonate (CaCO3) - Aragonite/Calcite organic gemstone

Pink Pearl (Calcium Carbonate (Aragonite/Calcite) with Conchiolin (CaCO3)) — mineral

Pink Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin (CaCO3)

Pearl (Calcium Carbonate (CaCO3) + Conchiolin) — mineral

Pearl

Calcium Carbonate (CaCO3) + Conchiolin

Natural Pearl (Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3) — mineral

Natural Pearl

Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3

Goethite (Goethite (FeO(OH))) — mineral

Goethite

Goethite (FeO(OH))

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

Pearl (Biogenic Gemstone)

Calcium Carbonate (Aragonite and Calcite) with Conchiolin

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

Pearl (Calcium Carbonate (CaCO3)) — mineral

Pearl

Calcium Carbonate (CaCO3)

Fossiliferous Jasper / Miriam Stone / Elephant Skin Jasper (Biogenic Chalcedony / Silicified Fossiliferous Limestone) — fossil

Fossiliferous Jasper / Miriam Stone / Elephant Skin Jasper

Biogenic Chalcedony / Silicified Fossiliferous Limestone

Baroque Pearl (Biogenic Calcium Carbonate (Aragonite/Conchiolin)) — mineral

Baroque Pearl

Biogenic Calcium Carbonate (Aragonite/Conchiolin)

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

Freshwater Pearl

Aragonite / Biogenic Calcium Carbonate (CaCO3)

Pearl (Biogenic Mineral) (Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3) — mineral

Pearl (Biogenic Mineral)

Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3

Pearl (Calcium Carbonate (Aragonite/Calcite mixed with Conchiolin), CaCO3) — mineral

Pearl

Calcium Carbonate (Aragonite/Calcite mixed with Conchiolin), CaCO3