Chert (Jasper variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Category
Organic Gemstone (Biogenic)
Browse organic gemstone (biogenic) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Dyed Coral
Calcium carbonate (CaCO3) - Calcite or Aragonite with dye
organic gemstone
Amber (Butterscotch/Egg Yolk Variety)
Succinite (Approx. C10H16O)
Organic Gemstone
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Chert (specifically Jasper or Flint type)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chert Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert Pebble
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Field Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)
metamorphic
Chert (Black Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Chert (Chalky/Gray Variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pearl
Calcium Carbonate (CaCO3) in the form of orthorhombic Aragonite and Conchiolin
mineral
Baroque Pearl
Calcium Carbonate (Aragonite or Calcite) and Conchiolin
Organic Gemstone
Amber (Cherry Amber)
Succinite (C10H16O)
Organic Gemstone
Amber (possibly polished or rough amber)
Natural fossil resin; not a mineral, with variable organic composition dominated by polymerized terpenes
gemstone
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper (Red-Brown)
Silicon Dioxide (SiO2) with Iron Oxide impurities
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Pink variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Red Chert/Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Natural or Cultured Pearl
Calcium Carbonate (Aragonite and Conchiolin), CaCO3
Mineral (Organic)
Amber
Succinite
Organic Mineraloid
Pearl (Cultured or Natural)
Aragonite (CaCO3) with Conchiolin
Organic Mineraloid
Chert (and Chert-based Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Sedimentary
Chert (and Quartzite)
Microcrystalline silica (SiO2)
sedimentary
Polished amber cabochon
Amber (fossilized plant resin; chiefly carbon, hydrogen, and oxygen, with variable organic compounds)
gemstone
Baltic amber beads
Amber (fossilized plant resin), commonly succinite; organic polymer dominated by resin acids
gemstone
Polished amber
Fossilized plant resin; primarily organic terpenoid compounds (succinite when Baltic-type)
gemstone
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Chert (Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (varietal Flint or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Weathered chert or silicified limestone
Microcrystalline quartz (SiO₂), likely chert formed by silicification of carbonate rock
sedimentary
Chert (Brown Variety)
Silicon dioxide (SiO2)
sedimentary