Rock Identifier

Category

Mineral (Biogenic Replacement)

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

Calcite in Matrix (Calcium Carbonate (CaCO3)) — mineral

Calcite in Matrix

Calcium Carbonate (CaCO3)

Bivalve Fossil (Shell-bearing Sedimentary Rock) (Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix) — fossil

Bivalve Fossil (Shell-bearing Sedimentary Rock)

Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix

Fossilized Coral (Rugosa / Scleractinia (Agatized or Calcitized Coral)) — fossil

Fossilized Coral

Rugosa / Scleractinia (Agatized or Calcitized Coral)

Fossilized Echinoid / Sea Urchin Internal Mold (Echinoidea internal cast (steinkern)) — fossil

Fossilized Echinoid / Sea Urchin Internal Mold

Echinoidea internal cast (steinkern)

Fossil Shark Tooth (Otodus sp. (possibly Otodus obliquus)) — fossil

Fossil Shark Tooth

Otodus sp. (possibly Otodus obliquus)

Fossil Shell (Bivalve) (Class Bivalvia (fossilized)) — fossil

Fossil Shell (Bivalve)

Class Bivalvia (fossilized)

Pearl (Aragonite (CaCO3 with conchiolin)) — mineral

Pearl

Aragonite (CaCO3 with conchiolin)

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

Pearl (Biogenic Mineraloid)

Calcium carbonate (Aragonite) and Conchiolin, CaCO3

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)

Hag Stone (Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)) — sedimentary

Hag Stone

Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)

Chert Pebble with Quartz Veining (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Pebble with Quartz Veining

Microcrystalline Quartz (SiO2)

Pearl (Calcium Carbonate (CaCO3)) — mineral

Pearl

Calcium Carbonate (CaCO3)

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)

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

Black Pearl (Tahitian Style)

Calcium Carbonate (Aragonite) - CaCO3 with Conchiolin

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

Spiny Oyster Shell

Spondylus varians (Biogenic Calcium Carbonate)

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

Abalone Shell (Mother of Pearl)

Aragonite (Biogenic Calcium Carbonate, CaCO3)

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

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

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

Pearl (Cultured Freshwater)

Calcium Carbonate (Aragonite) - CaCO3

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)

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

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

Fossilized shell or bone fragment

Indeterminate biogenic calcite or apatite fossil

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

Pearl

Organic Mineraloid (CaCO3 + Conchiolin)

Banded Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Microcrystalline Quartz (SiO2)

Fossiliferous limestone, likely coral or shell-rich limestone (Biogenic calcite (CaCO₃), commonly limestone containing fossil coral or mollusks) — fossil

Fossiliferous limestone, likely coral or shell-rich limestone

Biogenic calcite (CaCO₃), commonly limestone containing fossil coral or mollusks

Shark Tooth Fossil (Vertebrate fossilized tooth (Chondrichthyes)) — fossil

Shark Tooth Fossil

Vertebrate fossilized tooth (Chondrichthyes)

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

Pearl

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

Shark Tooth Fossil (Carcharocles megalodon or similar fossilized shark tooth) — fossil

Shark Tooth Fossil

Carcharocles megalodon or similar fossilized shark tooth

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

Pearl

Calcium Carbonate (CaCO3) with Conchiolin

Chert (with Iron Staining) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (with Iron Staining)

Microcrystalline Quartz (SiO2)

Chert (or possibly Flint) (SiO2 (Silicon Dioxide)) — Sedimentary Rock

Chert (or possibly Flint)

SiO2 (Silicon Dioxide)

Sedimentary Rock

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

Chert (Flint / Jasper / Hornstone)

Microcrystalline Quartz (SiO2)

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

Baroque Pearl

Biogenic Calcium Carbonate (Aragonite/Conchiolin)

Pearl (Calcium Carbonate (CaCO3)) — mineral

Pearl

Calcium Carbonate (CaCO3)

Fossiliferous Limestone (Limestone (CaCO3 - Calcium Carbonate)) — sedimentary

Fossiliferous Limestone

Limestone (CaCO3 - Calcium Carbonate)

Calcite (or Travertine / Limestone) (Calcium Carbonate (CaCO3)) — sedimentary

Calcite (or Travertine / Limestone)

Calcium Carbonate (CaCO3)

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

Fossilized Tiger Shark Tooth

Galeocerdo cuvier (fossilized hydroxylapatite)

Fossil oyster shell (Fossilized bivalve, likely Ostrea or Crassostrea; calcite (CaCO₃) shell) — fossil

Fossil oyster shell

Fossilized bivalve, likely Ostrea or Crassostrea; calcite (CaCO₃) shell

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

Mother of Pearl (Nacre)

Aragonite (layered with organic polymers), CaCO3

Pearl (Calcium Carbonate (CaCO3) in the form of Aragonite) — mineral

Pearl

Calcium Carbonate (CaCO3) in the form of Aragonite

Chert (Chalcedony/Agate) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)