Rock Identifier

Category

Mineral (Biogenic Replacement)

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

Pearl (Pearl (Calcium Carbonate with organic conchiolin, CaCO3)) — mineral

Pearl

Pearl (Calcium Carbonate with organic conchiolin, CaCO3)

Seashell Fragment (Aragonite/Calcite) (Calcium Carbonate (CaCO3) - Shell fragment) — sedimentary

Seashell Fragment (Aragonite/Calcite)

Calcium Carbonate (CaCO3) - Shell fragment

Sea Snail Shell (Top Shell) (Trochidae family (Calcium Carbonate, CaCO3)) — mineral

Sea Snail Shell (Top Shell)

Trochidae family (Calcium Carbonate, CaCO3)

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

Pearl (as a biogenic mineral/gemstone)

Calcium Carbonate (mostly Aragonite), CaCO3

Mother of Pearl (Nacre) (Aragonite with Conchiolin (CaCO3)) — mineral

Mother of Pearl (Nacre)

Aragonite with Conchiolin (CaCO3)

Pearl (Biogenic CaCO3 (Aragonite)) — mineral

Pearl

Biogenic CaCO3 (Aragonite)

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

Sea Shell Fragment (Calcium Carbonate)

Aragonite / Calcite (CaCO3)

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

Kidney Stone (Urolith)

Calculus renalis (Biogenic mineral aggregate)

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

Mixed Gemstone Collection

SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)

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

Pearl (Biogenic Mineral)

Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3

Precious Coral (Corallium rubrum (Calcium Carbonate, CaCO3)) — mineral

Precious Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

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

Oyster Shell Fragment

Crassostrea virginica (or related Bivalvia)

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 (Calcium carbonate (CaCO3) as Aragonite or Calcite) — mineral

Pearl

Calcium carbonate (CaCO3) as Aragonite or Calcite

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

Pearl

Calcium carbonate (CaCO3) - Aragonite/Calcite variety

Pearl (Biogenic) (Nacre / Calcium Carbonate (CaCO3)) — mineral

Pearl (Biogenic)

Nacre / Calcium Carbonate (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 Mineraloid) (Calcium carbonate (CaCO3) primarily as Aragonite) — mineral

Pearl (Biogenic Mineraloid)

Calcium carbonate (CaCO3) primarily as Aragonite

Kidney Stone (Urolith / Calcium Oxalate Stone) (Calcium Oxalate Monohydrate (Whewellite) / Calcium Oxalate Dihydrate (Weddellite)) — mineral

Kidney Stone (Urolith / Calcium Oxalate Stone)

Calcium Oxalate Monohydrate (Whewellite) / Calcium Oxalate Dihydrate (Weddellite)

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

Freshwater Pearl

Aragonite / Biogenic Calcium Carbonate (CaCO3)

Kidney Stone (Calcium Oxalate / Uric Acid) (Calcium Oxalate Monohydrate (Whewellite) / Calcium Oxalate Dihydrate (Weddellite)) — mineral

Kidney Stone (Calcium Oxalate / Uric Acid)

Calcium Oxalate Monohydrate (Whewellite) / Calcium Oxalate Dihydrate (Weddellite)

Seashell Fragment (Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite) — mineral

Seashell Fragment

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

Fossil Shark Tooth (Chondrichthyes dentition (Fossilized Tooth)) — fossil

Fossil Shark Tooth

Chondrichthyes dentition (Fossilized Tooth)

Pearl (Biogenic CaCO3 (Aragonite and Calcite)) — mineral

Pearl

Biogenic CaCO3 (Aragonite and Calcite)

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

Ammolite

Biogenic gemstone (Aragonite, CaCO3)

Shiva Eye Shell (Operculum) (Calcium Carbonate (Aragonite), CaCO3) — mineral

Shiva Eye Shell (Operculum)

Calcium Carbonate (Aragonite), CaCO3

Fossilized Shell (Invertebrate fossil (Bivalvia or Brachiopoda)) — fossil

Fossilized Shell

Invertebrate fossil (Bivalvia or Brachiopoda)

Marine gastropod shell (Calcareous mollusk shell, primarily aragonite (CaCO₃), likely a whelk or conch) — fossil

Marine gastropod shell

Calcareous mollusk shell, primarily aragonite (CaCO₃), likely a whelk or conch

Hag Stone (Perforated Sedimentary Rock (typically Limestone or Sandstone)) — sedimentary

Hag Stone

Perforated Sedimentary Rock (typically Limestone or Sandstone)

Pearl (Calcium Carbonate (Aragonite and Calcite), CaCO3) — mineral

Pearl

Calcium Carbonate (Aragonite and Calcite), CaCO3

Precious Red Coral (Corallium rubrum (Calcium Carbonate, CaCO3)) — mineral

Precious Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Pearl (incorporated into jewelry) (Aragonite and Calcite (CaCO3)) — mineral

Pearl (incorporated into jewelry)

Aragonite and Calcite (CaCO3)

Pearl (Calcium Carbonate (CaCO3) - mainly Aragonite and Calcite) — mineral

Pearl

Calcium Carbonate (CaCO3) - mainly Aragonite and Calcite

Pearl (Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)) — mineral

Pearl

Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)

Pearl (Calcium carbonate (CaCO3) in the form of Aragonite or Calcite) — mineral

Pearl

Calcium carbonate (CaCO3) in the form of Aragonite or Calcite

Pearl (Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)) — mineral

Pearl

Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)

Fossil Snail (Gastropoda (fossilized)) — fossil

Fossil Snail

Gastropoda (fossilized)

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

Chert (Yellow Jasper / Flint)

Microcrystalline Quartz (SiO2)

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

Pearl

Calcium Carbonate (Aragonite) - CaCO3

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

Pearl

Organic Mineral (CaCO3 with conchiolin)

Fossilized tooth or jaw fragment (likely fish or reptile) (Indeterminate vertebrate bone/tooth; mineralized hydroxyapatite, commonly Ca₅(PO₄)₃(OH)) — fossil

Fossilized tooth or jaw fragment (likely fish or reptile)

Indeterminate vertebrate bone/tooth; mineralized hydroxyapatite, commonly Ca₅(PO₄)₃(OH)