Natural Pearl
Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3
mineral
Category
Mineral (Biogenic)
Browse mineral (biogenic) specimens identified by the Rock Identifier community.
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Kidney Stone (Medical Specimen)
Calcium oxalate monohydrate (Whewellite) / CaC2O4·H2O
Mineral (Biogenic)
Fossilized Shark Tooth (Cretaceous to Neogene)
Elasmobranchii dental fossil (likely Squalicorax or similar species)
mineral (biogenic replacement)
Shell Cameo (Sardonyx Shell)
Cassis madagascariensis (Sardonyx shell)
mineral (biogenic silica/calcium carbonate substrate)
Spiny Oyster Shell
Spondylus (Calcium Carbonate, CaCO3)
mineral
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
mineral
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Seashell (Calcium Carbonate)
Calcium Carbonate (CaCO3)
mineral
Pearl (as a Biogenic Mineral)
Calcium Carbonate (mostly Aragonite) with Conchiolin; CaCO3
mineral
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Mother of Pearl (Nacre)
Aragonite with Conchiolin (CaCO3)
mineral
Pearl
Calcium carbonate (CaCO3) as Aragonite or Calcite
mineral
Human Skin (Epidermis/Dermis)
Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)
Mineral-like biological tissue
Pearl
Calcium Carbonate (CaCO3) - mainly Aragonite and Calcite
mineral
Pearl
Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)
mineral
Precious Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Seashell Fragment (Aragonite/Calcite)
Calcium Carbonate (CaCO3) - Shell fragment
sedimentary
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
mineral
Pearl
Calcium Carbonate (Aragonite) - CaCO3
mineral
Pearl
Calcium carbonate (CaCO3) - Aragonite/Calcite variety
mineral
Pearl
Biogenic CaCO3 (Aragonite)
mineral
Pearl
Organic Mineral (CaCO3 with conchiolin)
mineral
Fighting Conch (Sea Shell)
Strombus alatus (primarily composed of Calcium Carbonate / CaCO3)
mineral
Hag Stone
Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)
sedimentary
Seashell Fragment
Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Coquina
Biogenic Limestone
sedimentary
Fossiliferous Limestone (Coquina-like)
Biogenic Limestone
sedimentary
Pearl
Calcium Carbonate (CaCO3)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Pearl (as a biogenic mineral/gemstone)
Calcium Carbonate (mostly Aragonite), CaCO3
mineral
Abalone Shell (Nacre)
Aragonite (CaCO3) - Biogenic Mineral
mineral
Pearl
Calcium carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Black Pearl (Tahitian Style)
Calcium Carbonate (Aragonite) - CaCO3 with Conchiolin
mineral
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Pearl
Calcium Carbonate (Aragonite and Calcite), CaCO3
mineral
Pearl (incorporated into jewelry)
Aragonite and Calcite (CaCO3)
mineral
Pearl (Biogenic)
Nacre / Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic gemstone
mineral
Pink Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin (CaCO3)
mineral