Chert
Silicon dioxide (SiO2)
Sedimentary
Category
Mineral (Organic Gemstone)
Browse mineral (organic gemstone) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified wood (SiO2)
fossil
Chert (includes Flint & Jasper)
Chert (Siliceous sedimentary rock, chemical formula SiO2)
sedimentary
Fossilized Wood / Petrified Wood
Petrified Wood (Silicified Flora)
fossil
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2)
sedimentary
Graphite
Graphite (Carbon, C)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite
Organic Mineraloid
Hypersthene
Hypersthene ((Mg,Fe)SiO3)
mineral
Polished agate (likely plume or moss agate)
Chalcedony, microcrystalline quartz (SiO₂), with iron-oxide and possible chlorite inclusions
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2 with chlorite inclusions)
mineral
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions
mineral
Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Chalcedony / Agate with Botryoidal Quartz
Silicon Dioxide (SiO2)
sedimentary
Fossil Shark Tooth
Carcharodon or Carcharias fossil (Vertebrate Fossil)
sedimentary
Chert (specifically Flint or Common Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Oyster Shell Fragment
Crassostrea virginica (or related Bivalvia)
fossil
Sandstone
Arenite
sedimentary
Fossiliferous Sandstone / Mudstone
Sedimentary Rock (Clastic with Fossiliferous Inclusions)
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Glauconitic Sandstone
Glauconitic Quartz Arenite (with K,Mg,Fe,Al silicate hydroxide)
sedimentary
Fossilized bone, likely a large vertebrate limb or rib fragment
Petrified bone; exact taxon indeterminate from the image
fossil
Polished chalcedony (likely moss/ag ate)
Microcrystalline quartz, SiO₂; probable moss agate or jasper variety
mineral
Tumbled agate (likely moss or plume agate)
Microcrystalline quartz, primarily chalcedony (SiO₂), with iron-oxide and other mineral inclusions
mineral
Amber
Succinite (Fossilized Tree Resin, C10H16O)
mineral
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Fossil tooth fragment
Likely fossilized shark tooth or marine vertebrate tooth; exact taxon cannot be determined from the image
fossil
Amber-set ring
Amber (fossilized plant resin; organic mineraloid), set in a metal ring
gemstone
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Fossil plant impression slab
Fossilized plant compression/impression; exact taxon indeterminate from the image
fossil
Green Moss Agate / Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions
sedimentary
Chert (Nodular or Massive Variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO₂)
sedimentary
Fossilized tooth, likely a mammalian tooth fragment
Indeterminate fossil tooth; possibly an ungulate or carnivoran tooth
fossil
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host
mineral
Enrolled Trilobite Fossil
Phylum Arthropoda, Class Trilobita (likely Calymene or Flexicalymene)
fossil