Pink Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Category
Organic Gemstone (Sedimentary Associations)
Browse organic gemstone (sedimentary associations) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Sedimentary Associations) in the encyclopedia
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Fossiliferous Sandstone
Sedimentary rock containing invertebrate fossils
fossil
Pyrite
Iron Disulfide (FeS2)
mineral
Tree Agate
Chalcedony with Dendritic Chlorite (SiO2 with impurities)
sedimentary/mineral
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Precious Coral
Corallium rubrum (Calcium carbonate with trace carotene)
Organic gemstone / Sedimentary mineraloid
Chert (Pink variety)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Ironstone concretion / Limonitic Sandstone
Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)
sedimentary
Chert (Green Fossilized Algae or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chrysocolla-bearing copper mineral specimen (probable turquoise/chrysocolla mix)
Chrysocolla, Cu₂H₂Si₂O₅(OH)₄·nH₂O, with possible turquoise CuAl₆(PO₄)₄(OH)₈·4H₂O and copper oxides
mineral
Likely calcite-rich limestone
Calcite (CaCO₃), probably micritic or fossiliferous limestone
sedimentary
Amber
Succinates (Organic compound: C10H16O)
mineraloid
Chert (and Chert-based Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Sedimentary
Chert (and Quartzite)
Microcrystalline silica (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Chert Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (chemical formula: C10H16O)
Organic Gemstone (not a rock or mineral)
Chert (Brown variety / Common Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Amber
Succinite (fossilized resin)
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Turquoise and Spiny Oyster (Heishi style beads)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Spondylus (Spiny Oyster shell)
mineral and organic gemstone
Mica Schist with Pyrite
Mica Schist (FeS2 containing)
metamorphic
Chert (often called Flint or Chalcedony Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Quartz Vein Pebble
Silicon dioxide (SiO2)
metamorphic
Satin Spar Gypsum (Satin Spar Selenite)
Hydrous calcium sulfate (CaSO4%2H2O)
mineral
Turquoise and Red Coral
Turquoise: CuAl6(PO4)4(OH)8·4H2O; Red Coral: Corallium rubrum (organic gemstone)
mineral
Chert (Jasper/Agate Peat)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (Fossilized Tree Resin)
gemstone
Precious Red Coral
Corallium rubrum / Corallium japonicum
mineral (organic gemstone)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pearl
Calcium carbonate (Aragonite/Calcite) - CaCO3
gemstone
Chert (Iron-rich variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary