Pearl
Calcium Carbonate (Aragonite) with Conchiolin; formula: CaCO3
mineral
Category
Organic Gemstone (Not A Mineral)
Browse organic gemstone (not a mineral) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Not A Mineral) in the encyclopedia
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Bauxite (Pisolitic Bauxite)
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Precious Red Coral
Corallium rubrum / Corallium japonicum
mineral (organic gemstone)
Amber
Succinite (fossilized resin)
mineral
Obsidian
Amorphous volcanic glass (principally SiO2)
igneous
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
sedimentary
Amber
Succinite
mineral
Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Natural White Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3
mineraloid
Blue Apatite
Calcium Phosphate (Ca5(PO4)3(F,Cl,OH))
mineral
Lapis Lazuli (polished cabochon)
Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)
metamorphic
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Pearl
Nacre (Aragonite and Conchiolin), CaCO3
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Opalite
Synthetic Opalised Glass
mineral
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Black Pearl (Tahitian Pearl)
Aragonite / Calcite (CaCO3) with Conchiolin
mineral
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Pearl
Organic Mineral (CaCO3 with conchiolin)
mineral
Pearl
Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Bauxite
Bauxite (Mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Black Obsidian
Amorphous volcanic glass (SiO2)
igneous
Lapis Lazuli
Lapis Lazuli (Complex aggregate mainly of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxide
mineral
Sandstone (with Lichen)
Arenite (primarily SiO2)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Moss Agate / Chalcedony
Silicon Dioxide (SiO2)
mineral
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Amber (Copal)
Succinite (fossilized tree resin)
mineral
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Amber
Succinite (C10H16O)
mineraloid
Lapis Lazuli
Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions of Chlorite, Manganese, or Iron
mineral
Snowflake Obsidian
Obsidian with Cristobalite inclusions (Amorphous SiO2 + SiO2 inclusions)
igneous
Obsidian
Volcanic glass (primary composition: SiO2)
igneous
Lapis Lazuli
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Moss Agate
Cryptocrystalline Quartz (SiO2 with Manganese or Iron Oxide inclusions)
mineral