Petrified Wood
Silicified Wood (SiO2)
mineral
Category
Organic Mineral
Browse organic mineral specimens identified by the Rock Identifier community.
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Glauconitic Sandstone
Glauconitic Quartz Arenite
sedimentary
Chert with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
sedimentary
Agatized Petrified Wood
Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood
metamorphic
Moss Agate
Chalcedony (Silicon Dioxide - SiO2) with inclusions
Mineral
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Mudstone)
Microcrystalline Quartz (SiO2)
sedimentary
Aragonite crystal cluster
Aragonite, orthorhombic calcium carbonate (CaCO₃)
mineral
Fossil Shark Tooth
Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)
fossil
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Green Sandstone
Glauconitic Sandstone
sedimentary
Coquina / Shelly Sandstone
Calcareous Sandstone / Coquina
sedimentary
Asphalt aggregate
Human-made bituminous asphalt containing crushed silicate rock aggregate
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Shark Tooth Fossil
Carcharodonta (order Lamniformes), likely Carcharias spp.
fossil
Chert (White Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Calligraphy Stone
Fossiliferous Limestone (containing Hematite and Shells)
sedimentary
Seashell Fossil
Gastropoda fossil
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline to cryptocrystalline quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fancy Jasper
Silicon Dioxide (SiO2) with iron and organic inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified wood (primarily Quartz, SiO2)
fossil
Fossilized Fish Skeleton in Matrix
Vertebrata (Class: Actinopterygii), typically found in limestone or shale matrices
sedimentary
Petrified Dinosaur Bone (Gembone)
Agatized Dinosaur Bone
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Fossilized ammonite fragment
Ammonoidea; likely an ammonite suture-section specimen, commonly Jurassic–Cretaceous
fossil
Amber (possibly a small polished amber cabochon)
Fossilized tree resin; amber is an organic gemstone, not a mineral
gemstone
Graphite-bearing schist (probable)
Graphite schist; chiefly quartz, mica, and graphite
metamorphic
Concretion (likely iron-rich sandstone or claystone concretion)
Diagenetic carbonate/iron-oxide concretion; exact mineralogy requires testing
sedimentary
Amber
Succinite (fossilized tree resin)
fossil
Amber
Succinite (Resinite)
Organic Crystal (Mineraloid)
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Tahitian Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral