Chert (often called Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
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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Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Garden Quartz (Lodolite / Inclusion Quartz)
Quartz with inclusions (SiO2 with various mineral inclusions)
gemstone
Freshwater Pearl
Aragonite / Biogenic Calcium Carbonate (CaCO3)
mineral
Red coral beads
Precious coral, commonly Corallium rubrum (calcium-carbonate skeleton)
gemstone
Amber
Succinate (Fossilized Tree Resin)
gemstone
Amber / Fossilized Resin
Succinite / Fossilized Tree Resin
mineral
Amber
Succinite (a fossilized organic resin)
mineral
Chert (Brown Variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Chert (composition: SiO2)
sedimentary
Coal (Bituminous / Anthracite)
Organic Sedimentary Rock (Carbonaceous Rock)
sedimentary
Chert (Basanite / Jasperoid)
Microcrystalline Quartz (SiO2)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
sedimentary
Amber jewelry (possibly amber-colored glass or resin)
Amber — fossilized plant resin, chiefly composed of polymerized terpenoids; the pictured material cannot be confirmed from the image
gemstone
Amber
Fossilized Tree Resin
gemstone
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White-Tan variety)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Black Limestone with Calcite Veining
Bituminous Limestone (CaCO3 with Organic Carbon inclusions)
sedimentary
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Mineral (Organic Gemstone)
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Black Limestone
Bituminous Limestone (Calcium Carbonate - CaCO3)
sedimentary
Amber
Succinite (C10H16O)
mineral
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Chert (Red Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Carved red coral bead (likely coral or coral-colored resin)
Corallium spp. (precious coral; calcium carbonate, CaCO₃)
gemstone
Mixed Gemstone and Mineral Collection
Silicon Dioxide (SiO2) based minerals and others
mineral
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
gemstone
Pink Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineraloid
Amber (Copal)
Fossilized Tree Resin (C10H16O)
mineral
Turquoise and Spiny Oyster (Heishi style beads)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Spondylus (Spiny Oyster shell)
mineral and organic gemstone
Chert (Siliceous Mudstone variant)
Microcrystalline quartz (SiO2)
sedimentary
Black Pearl (Tahitian Pearl)
Aragonite / Calcite (CaCO3) with Conchiolin
mineral
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Amber
Fossilized Tree Resin
gemstone
Blue Apatite
Apatite group (Ca5(PO4)3(F,Cl,OH))
mineral
Amber
Organic gemstone (Succinite is common if from the Baltic)
mineral
Amber
Succinite (approximate formula C10H16O)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Pearl
Calcium Carbonate (primarily Aragonite and Calcite), CaCO3
mineral
Red Coral (with Hematite and Black Pearl accents)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral