Pearl (Biogenic Mineraloid)
Calcium carbonate (Aragonite) and Conchiolin, CaCO3
mineral
Category
Mineral (Biogenic)
Browse mineral (biogenic) specimens identified by the Rock Identifier community.
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Fighting Conch (Sea Shell)
Strombus alatus (primarily composed of Calcium Carbonate / CaCO3)
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Bivalve Fossil (Shell-bearing Sedimentary Rock)
Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix
fossil
Pearl
Calcium Carbonate (CaCO3)
mineral
Black Pearl (Tahitian Style)
Calcium Carbonate (Aragonite) - CaCO3 with Conchiolin
mineral
Pearl
Biogenic CaCO3 (Aragonite and Calcite)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Pearl (Biogenic Mineral)
Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3
mineral
Pearl (Cultured Freshwater)
Calcium Carbonate (Aragonite) - CaCO3
mineral
Spiny Oyster Shell
Spondylus varians (Biogenic Calcium Carbonate)
mineral
Stromatolite
Biogenic sedimentary structure (Stromatolite)
fossil
Calcite
Calcium Carbonate (CaCO3)
mineral
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic gemstone
mineral
Pink Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin (CaCO3)
mineral
Pearl
Calcium Carbonate (CaCO3) + Conchiolin
mineral
Oyster Shell Fragment
Crassostrea virginica (or related Bivalvia)
fossil
Kidney Stone (Calcium Oxalate / Uric Acid)
Calcium Oxalate Monohydrate (Whewellite) / Calcium Oxalate Dihydrate (Weddellite)
mineral
Goethite
Goethite (FeO(OH))
mineral
Kidney Stone (Urolith)
Calculus renalis (Biogenic mineral aggregate)
mineral
Red Coral (with Hematite and Black Pearl accents)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Tiger Shark Tooth
Galeocerdo cuvier (fossilized hydroxylapatite)
sedimentary
Shiva Eye Shell (Operculum)
Calcium Carbonate (Aragonite), CaCO3
mineral
Kidney Stone (Urolith / Calcium Oxalate Stone)
Calcium Oxalate Monohydrate (Whewellite) / Calcium Oxalate Dihydrate (Weddellite)
mineral
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
sedimentary
Chert (with Iron Staining)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Organic Mineraloid (CaCO3 + Conchiolin)
mineral
Fossiliferous Limestone
Limestone (CaCO3 - Calcium Carbonate)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Coquina Limestone
Coquina (Biogenic Limestone)
sedimentary
Coquina
Biogenic Limestone (Calcitic)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (CaCO3)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Freshwater Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic composite
gemstone
Chert (Pebble)
Microcrystalline Quartz (SiO2)
sedimentary