Pearl
Calcium Carbonate (CaCO3)
mineral
Category
Biogenic Material
Browse biogenic material specimens identified by the Rock Identifier community.
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Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Chert (Flint)
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Pearl
Aragonite and Calcite (CaCO3) with Conchiolin
mineral
Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone with possible fossil inclusions
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Shell Cameo
Cypraecassis rufa (Bullmouth Queen Helmet Shell)
mineraloid / biogenic specimen
Calcite (or Travertine / Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Abalone Shell (Mother of Pearl)
Aragonite (Biogenic Calcium Carbonate, CaCO3)
mineral
Oyster Shell (Aragonite/Calcite)
Calcium Carbonate (CaCO3)
sedimentary
Pearl
Calcium Carbonate (Aragonite/Calcite mixed with Conchiolin), CaCO3
mineral
Stromatolite
Biogenic Sedimentary Rock (composed predominantly of CaCO3)
sedimentary
Fossiliferous Limestone (with Rugose Coral)
Limestone with Tetracoralla (Rugosa) fossil
fossil
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Operculum shell (often called "Shiva's Eye" or "Cat's Eye")
Operculum of a gastropod (e.g., Turbinidae family), primarily Calcium Carbonate (CaCO3) in the form of aragonite.
fossil
Black Pearl (Tahitian Type)
Aragonite / Conchiolin composite (CaCO3)
mineraloid
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Chert (Flint / Jasper / Hornstone)
Microcrystalline Quartz (SiO2)
sedimentary
Green Chert (Jasper / Flint)
Silicon Dioxide (SiO2)
sedimentary
Black Pearl (Tahitian-style Cultured Pearl)
Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)
mineral
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Red Coral (Precious Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
gemstone
Chert (Jasper / Flint)
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Staghorn Coral Specimen
Acropora cervicornis (Calcium Carbonate, CaCO3)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Pearl (Biogenic Gemstone)
Calcium Carbonate (Aragonite and Calcite) with Conchiolin
gemstone
Freshwater Pearl
Aragonite / Biogenic Calcium Carbonate (CaCO3)
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with marine fossils
fossil
Fossiliferous Limestone
Biogenic Sedimentary Rock (primarily CaCO3)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Fragments
sedimentary
Fossiliferous Limestone
Biogenic Limestone (CaCO3 with fossil fragments)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Baroque Pearl
Biogenic Calcium Carbonate (Aragonite/Conchiolin)
mineral
Stromatolite (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone (Murchisonia/Gastropod Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary