Pearl necklace
Pearl (biogenic calcium carbonate, chiefly aragonite; CaCO₃)
gemstone
Category
Organic Gemstone (Not A Rock Or Mineral)
Browse organic gemstone (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Not A Rock Or Mineral) in the encyclopedia
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Polished amber
Amber (fossilized plant resin; chiefly amorphous organic compounds)
gemstone
Amber cabochon pendant
Amber (fossilized tree resin; chiefly polymerized terpenoids)
gemstone
Chert (Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Calcium carbonate (CaCO3) as Aragonite or Calcite
mineral
Fossilized Coral (Petrified Coral)
Lithostrotionella (example genus) / Scleractinia
fossil
Red Coral
Corallium rubrum
mineral
Chert (Flint Pebbles)
Microcrystalline Quartz (SiO2)
sedimentary
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Chert (Jasper/Mudstone variety with Oxidation)
Silicon dioxide (SiO2)
sedimentary
Tahitian black pearl strand
Cultured pearl; aragonite (CaCO₃) nacre
gemstone
Precious Red Coral
Corallium rubrum / Corallium japonicum
mineral (organic gemstone)
Amber
Succinite (with formula approximately C10H16O)
Organic mineraloid
Polished amber
Fossilized tree resin (primarily organic polymerized diterpenes)
gemstone
Amber
Succinrite (Organic Gemstone)
mineraloid
Amber
Amber (C10H16O)
mineral
Amber
Fossilized tree resin (Amorphous organic polymer)
gemstone
Red Chert
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
Mineral (Variety of Chalcedony)
Amber
Succinite (organic hydrocarbon)
mineraloid
Petrified Wood
Silicified Wood (SiO2)
mineral
Polished fossiliferous limestone
Bioclastic carbonate rock, primarily calcite (CaCO₃)
sedimentary
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Amber
Succinite (Fossilized Resin)
mineral
Likely bituminous coal
Coal, predominantly carbon-rich organic matter with variable maceral and mineral content
sedimentary
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Pearls (likely freshwater cultured pearls)
Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin
gemstone
Amber
Resinite / Fossilized Tree Resin
mineral
Amber
Succinates (Fossilized Tree Resin)
mineral
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Red Coral (Precious Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
sedimentary
Pearl necklace
Pearl, primarily aragonite (CaCO₃) and conchiolin
gemstone
Amber (in Matrix/Shale)
Amber (Fossilized Tree Resin)
mineral
Dyed Pink Quartzite (Jadeite Simulant)
Silicon Dioxide (SiO2) with organic dye
metamorphic
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Precious Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Turquoise and Red Coral (with Grizzly Bear Claw)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Precious Coral (Corallium rubrum)
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary