Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Category
Organic Gemstone (Mineraloid)
Browse organic gemstone (mineraloid) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Mineraloid) in the encyclopedia
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Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
mineral
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or Chalcedony Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Agate Peat)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Amber Inlay Jewelry
Fossilized Resin (C10H16O)
Organic Gemstone (Biogenic)
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amber (possibly copal)
Fossilized plant resin; amber is organic resin, commonly dominated by polymerized terpenoids
gemstone
Tumbled amber
Amber (fossilized plant resin), primarily cross-linked diterpenoid organic compounds
gemstone
Chert (Brown variety / Common Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
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
Ambergris
Physeter macrocephalus excreta (Ambergris)
mineraloid / organic geological find
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Chert (specifically Jasper or Flint type)
Microcrystalline Quartz (SiO2)
sedimentary
Ambergris
Ambrein (C30H52O)
mineraloid / organic geological substance
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
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
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