Kidney Stone (Urolith / Calcium Oxalate Stone)
Calcium Oxalate Monohydrate (Whewellite) / Calcium Oxalate Dihydrate (Weddellite)
mineral
Category
Organic Gemstone (Biogenic)
Browse organic gemstone (biogenic) specimens identified by the Rock Identifier community.
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Cleavable Calcite
Calcium Carbonate (CaCO3)
mineral
Vesicular Limestone with Borings
Fossiliferous Calcarenite (Calcium Carbonate, CaCO3)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Calcite in Matrix
Calcium Carbonate (CaCO3)
mineral
Oyster Shell (Biogenic Calcium Carbonate)
Crassostrea virginica (or related species) - Calcium Carbonate (CaCO3)
sedimentary
Calcite (likely a tumbled specimen)
Calcite (CaCO 3 )
Mineral
Calcite
Calcite (Mineral; CaCO₃)
Mineral
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Calcite
Calcite (CaCO3)
Mineral
Chert (or possibly Flint)
SiO2 (Silicon Dioxide)
Sedimentary Rock
Calcite
Calcite (CaCO3)
Mineral