Land Snail Shell
Gastropoda (Calcium Carbonate, CaCO3)
fossil
Category
Mineral (Biogenic)
Browse mineral (biogenic) specimens identified by the Rock Identifier community.
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Pearl
Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin
mineraloid
Pearl
Calcium Carbonate (CaCO3) in the form of Aragonite
mineral
Freshwater Pearl
Aragonite / Biogenic Calcium Carbonate (CaCO3)
mineral
Mother of Pearl (Nacre)
Aragonite (layered with organic polymers), CaCO3
mineral
Fossiliferous Limestone
Biogenic Sedimentary Rock
sedimentary
Stromatolite
Biogenic sedimentary rock
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Coquina
Biogenic Limestone (CaCO3)
sedimentary
Coquina / Shelly Limestone
Coquina (Biogenic Limestone)
sedimentary
Ammolite
Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)
mineral
Pearl
Calcium Carbonate (CaCO3)
mineral
Abalone Shell (Mother of Pearl)
Aragonite (Biogenic Calcium Carbonate, CaCO3)
mineral
Pearl
Calcium Carbonate (Aragonite/Calcite mixed with Conchiolin), CaCO3
mineral
Pearl
Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)
mineral
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Pearl
Aragonite and Calcite (CaCO3) with Conchiolin
mineral
Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Baroque Pearl
Biogenic Calcium Carbonate (Aragonite/Conchiolin)
mineral
Calcite (or Travertine / Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Black Pearl (Tahitian-style Cultured Pearl)
Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)
mineral
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Calcite in Matrix
Calcium Carbonate (CaCO3)
mineral
Stromatolite
Laminated biogenic sedimentary structure (Cyanobacteria)
sedimentary
Coquina (Limestone)
Bioclastic Limestone (CaCO3)
sedimentary
Fossil Shark Tooth
Otodus sp. (possibly Otodus obliquus)
fossil
Chert (Agate / Jasper pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl (Pendant)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
gemstone
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized shell or bone fragment
Indeterminate biogenic calcite or apatite fossil
fossil
Pearl
Calcium Carbonate (primarily Aragonite and Calcite), CaCO3
mineral
Chert (Nodule)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Mother of Pearl (Nacre)
Calcium Carbonate (Aragonite) with organic conchiolin
gemstone
Chert (Jasper / Iron-stained Chert)
Microcrystalline Quartz (SiO2 with Fe-oxides)
sedimentary