Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
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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Chert (with Epidote/Quartz veining)
Cryptocrystalline silica (SiO2) with Epidote/Quartz inclusions
sedimentary
Sandstone Chert Concretion
Silica-cemented Concretion (primarily SiO2)
sedimentary
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified wood / Permineralized wood (SiO2)
fossil
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Copper Ore Bearing Rock
Host rock with secondary copper minerals (such as Malachite, Azurite, and Chrysocolla)
mineral
Yellow Agate (Banded Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper-like Silicate)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Fossilized Tree Resin (Generic formula roughly C10H16O)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Amber
Succinite (organic gemstone, approx. C10H16O)
fossil
Amber (Simulated/Faturan Style)
Resin mix (Likely Phenolic/Celluloid if synthetic, Succinite if natural)
Organic Gemstone (not a mineral)
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Weathered Coastal Boulder)
Arenite (composed primarily of SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Quartz, SiO2)
fossil
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Unakite
Epidotized Granite
metamorphic
Amazonite
Microcline Feldspar (KAlSi3O8)
mineral
Lake Superior Agate
Banded Chalcedony (Silicon Dioxide / SiO2)
mineral
Quartz (Agate/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Chert with Quartz/Calcite Vein
Microcrystalline Silica (SiO2)
sedimentary
Pearl
Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)
mineral
Variscite
Variscite (AlPO4·2H2O)
mineral
Fossilized Shark Tooth
Chondrichthyes (Class) fossilized tooth
fossil
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 principal component)
sedimentary
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in sedimentary host rock
sedimentary
Amethyst, Aquamarine, and Pearl Ring
SiO2 (Amethyst), Be3Al2Si6O18 (Aquamarine), CaCO3 (Pearl)
gemstone
Chert (Jaspery variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint Nodules)
Chert (Silicon Dioxide, SiO2)
sedimentary
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Tree Agate (or Moss Agate)
Dendritic Agate (Silicon Dioxide - SiO2)
mineral
Fossilized Coral
Cnidaria fossil / Calcite-replaced coral
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Amber
Succinite (fossilized resin)
mineral