Pyrite
Iron Sulfide (FeS2)
mineral
Category
Organic Gemstone (Not A Mineral)
Browse organic gemstone (not a mineral) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Not A Mineral) in the encyclopedia
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Mosasaur Tooth Fossil
Mosasaurid vertebrate fossil (Hydroxyapatite)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Fossilized Shark Tooth
Carcharhinus sp. (likely Bull or Requiem shark family)
sedimentary
Chert (variations include Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pearl
Aragonite and Conchiolin (CaCO3 + organic protein)
mineraloid
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Pearl
Calcium Carbonate (Aragonite) - CaCO3
mineral
Gray River Pebble (likely Limestone or Siltstone)
Sedimentary Rock (Calcium Carbonate or Siliciclastic)
sedimentary
Chert (with Epidote/Quartz veining)
Cryptocrystalline silica (SiO2) with Epidote/Quartz inclusions
sedimentary
Sandstone (likely Fossiliferous Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz (Milky/Rose variety)
Silicon Dioxide (SiO2)
mineral
Cubic Zirconia (Faceted)
Zirconium dioxide (ZrO2)
mineral
Fossilized Shark Tooth (Otodus)
Otodus obliquus
fossil
Chert (Jasper variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Ironstone Concretion
Goethite-rich Siltstone / Siderite (FeCO3)
sedimentary
Jasper with Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amber
Succinite (fossilized resin); C10H16O
mineraloid
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Garnet (Almandine)
Almandine Fe3Al2(SiO4)3
mineral
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Amber
Succinite
Organic Mineral
Chert (variations include Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (a specific common type) or Fossilized Tree Resin (C10H16O)
Mineraloid
Amber
Succinite (C10H16O)
Mineraloid
Amber
Succinite (Resinite)
Organic Crystal (Mineraloid)
Fossilized Coprolite
Coprolite (fossilized feces)
sedimentary
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
Green Moss Agate
Agate (Silicon Dioxide - SiO2) with inclusions of hornblende or chlorite
mineral
Tree Agate (or Moss Agate)
Dendritic Agate (Silicon Dioxide - SiO2)
mineral
Fossilized Shark Tooth
Otodus sp. (approximate genus) / Hydroxyapatite fossil
sedimentary
Chert (specifically Jasper or Flint type)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossilized Shark Tooth
Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)
Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Banded Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Bone (Petrified Bone)
Permineralized Vertebrate Remains
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral