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
Pearl (Biogenic Mineral)
Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3
mineral
Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Asphalt
Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)
Sedimentary
Kidney Stone
Calculus (Calcium oxalate/Calcium phosphate)
mineral
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Pearl jewelry
Pearl (biogenic calcium carbonate, primarily aragonite, CaCO₃)
gemstone
Polished Baltic amber with insect inclusion
Amber (fossilized plant resin), chiefly polymerized diterpenoid resin; likely succinite
gemstone
Opalite (a synthetic glass)
Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant
Mineral Simulant (Synthetic Glass)
Amber
Amber (C10H16O)
mineral
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
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
Amber
Organic gemstone (Succinite)
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)
Raw Amber / Resin Mineral
Succinite (Fossilized Tree Resin)
gemstone
Fossilized ammonite
Ammonoidea (likely a small, chambered ammonite fossil)
fossil
Spiny Oyster Shell
Spondylus (Calcium Carbonate, CaCO3)
mineral
Amber
Succinite
mineral
Fossil bivalve shell
Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features
fossil
Amber
Succinite (Fossilized Tree Resin)
gemstone
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Amber (Copal)
Succinite (fossilized resin)
mineral
Pearl
Nacre (primarily aragonite, CaCO₃, in an organic conchiolin matrix)
gemstone
Opalite (Man-made Glass)
Fused glass (typically made of dolomite and metal opacifiers)
Man-made Material / Glass
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (Mineralized Apatite / Bio-apatite)
fossil
Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
mineral
Moss Agate
SiO2 (Cryptocrystalline Quartz)
gemstone
Amber
Succinite (specifically for Baltic amber); Chemical formula approximately C10H16O
mineral
Amber
Fossilized Tree Resin
gemstone
Green Moss Agate
Silicon Dioxide (SiO2) with Mineral Inclusions
sedimentary
Tonsil Stone (Tonsillolith)
Calcium phosphate / Calcium carbonate biomineral
mineral
Amber (fossilized tree resin)
Succinite; organic resin composed mainly of polymerized terpenoids
fossil
Precious Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Polished amber
Fossilized tree resin (primarily organic polymerized diterpenes)
gemstone
Fossil bivalve shell
Ribbed pectinid or related bivalve; originally calcite/aragonite (CaCO₃), likely partially mineralized
fossil
Amber
Succinite (fossilized resin)
Mineral
White Coral
Corallium rubrum (biocarbonate calcium) / CaCO3
mineral