Red Coral
Corallium rubrum (for precious red coral), although other species like Corallium japonicum and Paracorallium are also used.
Organic Gemstone (not a rock or mineral in the traditional sense, but bio-mineralized material)
Category
Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)
Browse organic gemstone (not a rock or mineral in the traditional sense, but bio mineralized material) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material) in the encyclopedia
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Natural Pearl
Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3
mineral
Fossil Shark Tooth
Carcharocles (Otodus) sp. or similar fossilized Chondrichthyes tooth
sedimentary
Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Pearl (Biogenic Mineral)
Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3
mineral
Asphalt
Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)
Sedimentary
Kidney Stone
Calculus (Calcium oxalate/Calcium phosphate)
mineral
Opalite (a synthetic glass)
Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant
Mineral Simulant (Synthetic Glass)
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
Amber
Amber (C10H16O)
mineral
Fossil bivalve shell
Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features
fossil
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Slag Glass
Amorphous Silica Glass (with metal oxide inclusions)
Mineraloid / Industrial Waste
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Spiny Oyster Shell
Spondylus (Calcium Carbonate, CaCO3)
mineral
Amber
Organic gemstone (Succinite)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Amber
Succinite
mineral
Raw Amber / Resin Mineral
Succinite (Fossilized Tree Resin)
gemstone
Amber
Succinite (Fossilized Tree Resin)
gemstone
Opalite (Man-made Glass)
Fused glass (typically made of dolomite and metal opacifiers)
Man-made Material / Glass
Amber (Copal)
Succinite (fossilized resin)
mineral
Moss Agate
SiO2 (Cryptocrystalline Quartz)
gemstone
Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
mineral
Tonsil Stone (Tonsillolith)
Calcium phosphate / Calcium carbonate biomineral
mineral
Fossil Shark Tooth
Chondrichthyes tooth fossil
fossil
Amber
Succinite (specifically for Baltic amber); Chemical formula approximately C10H16O
mineral
Fossilized Bivalve Shell
Class Bivalvia (fossilized)
fossil
Green Moss Agate
Silicon Dioxide (SiO2) with Mineral Inclusions
sedimentary
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Amber
Succinite (fossilized resin)
Mineral
Gneiss
Gneiss
metamorphic
Amber
Fossilized Tree Resin
gemstone
Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (Mineralized Apatite / Bio-apatite)
fossil
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)
sedimentary
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral