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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Chert (Yellow Jasper / Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Kidney Stone (Urolith)
Calculus renalis (Biogenic mineral aggregate)
mineral
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
mineral
Hag Stone
Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)
sedimentary
Bivalve Fossil (Shell-bearing Sedimentary Rock)
Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix
fossil
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Calcium Carbonate (Aragonite) - CaCO3
mineral
Pearl (Biogenic Mineral)
Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3
mineral
Turquoise-and-coral silver jewelry brooch
Turquoise: hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O; red cabochons appear to be coral, likely set in silver
gemstone
Pearl
Organic Mineral (CaCO3 with conchiolin)
mineral
Stromatolite
Biogenic sedimentary structure (Stromatolite)
fossil
Fighting Conch (Sea Shell)
Strombus alatus (primarily composed of Calcium Carbonate / CaCO3)
mineral
Bivalve Shell Fragment (Biogenic Calcite/Aragonite)
Calcium carbonate (CaCO3, primarily aragonite/calcite)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Spiny Oyster Shell
Spondylus varians (Biogenic Calcium Carbonate)
mineral
Stromatolite
Biogenic sedimentary rock
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Coquina
Biogenic Limestone (CaCO3)
sedimentary
Coquina / Shelly Limestone
Coquina (Biogenic Limestone)
sedimentary
Pearl
Calcium Carbonate (CaCO3)
mineral
Oyster Shell Fragment
Crassostrea virginica (or related Bivalvia)
fossil
Goethite
Goethite (FeO(OH))
mineral
Black Pearl (Tahitian Style)
Calcium Carbonate (Aragonite) - CaCO3 with Conchiolin
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Red Coral (with Hematite and Black Pearl accents)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Coquina
Biogenic Limestone (Calcitic)
sedimentary
Coquina Limestone
Coquina (Biogenic Limestone)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (CaCO3)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Pearl (Cultured Freshwater)
Calcium Carbonate (Aragonite) - CaCO3
mineral
Abalone Shell (Mother of Pearl)
Aragonite (Biogenic Calcium Carbonate, CaCO3)
mineral
Freshwater Pearl
Aragonite / Biogenic Calcium Carbonate (CaCO3)
mineral
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Stromatolite
Laminated biogenic sedimentary structure (Cyanobacteria)
sedimentary