Chert / Flint
Chert (SiO2)
sedimentary
Category
Mineral (Organic Gemstone)
Browse mineral (organic gemstone) specimens identified by the Rock Identifier community.
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Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Green Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Light Grey / Flint variant)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint or Common Chert)
Silicon Dioxide (SiO2)
sedimentary
Amber (or polished Chalcedony bead)
Fossilized Tree Resin / SiO2 (Silicon Dioxide if Chalcedony)
gemstone
Amber
Succinite (specific to Baltic amber), fossilized tree resin
mineraloid
Polished operculum (“Shiva eye” shell)
Calcium-carbonate shell operculum, commonly from a turban snail (family Turbinidae); not a mineral specimen
fossil
Polished amber
Fossilized plant resin; primarily organic terpenoid compounds (succinite when Baltic-type)
gemstone
Shale or Slate
Shale (Sedimentary) or Slate (Metamorphic)
sedimentary or metamorphic
Ironstone concretion / Limonitic Sandstone
Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Chert (specifically Flint or Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Amber (Cherry or Red variety)
Succinite (with various trace amounts of organic compounds)
Organic Gemstone (not a rock)
Quartz (Smoky/Rose Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper / Petrified Wood)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl necklace (likely cultured pearls)
Pearl; chiefly aragonite (CaCO₃) in an organic conchiolin matrix
gemstone
Red Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Coprolite
Fossilized Feces
fossil
Chert (often called Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Black Chert/Flint)
Microcrystalline quartz (SiO2)
sedimentary
Polished amber
Amber (fossilized plant resin; primarily organic polymerized terpenes)
gemstone
Chert (specifically White Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Nut / Coprolite / Concretion
Trace Fossil / Permineralized Plant Material
fossil
Amber
Succinite (Fossilized Tree Resin)
fossil
Tumbled moss agate
Chalcedony (microcrystalline quartz, SiO₂) with moss-like inclusions
mineral
Amber
Succinates (C10H16O)
mineraloid
Fossilized Shark Tooth (fragment)
Elasmobranchii (Class) fossil
fossil
Fossil gastropod shell
Fossilized marine gastropod; exact genus/species cannot be determined from the image
fossil
Mocha Stone (Dendritic Agate)
Silicon Dioxide (SiO2) with Manganese/Iron inclusions
sedimentary
Amber
Succinicum (Organic compound, primarily C10H16O)
Organic Gemstone (Mineraloid)
Tufa
Calcareous Tufa (CaCO3)
sedimentary