Red Jasper
Jasper (Silicon Dioxide with Iron inclusions - SiO2)
Sedimentary/Metamorphic
Category
Organic Gemstone (Not A Mineral)
Browse organic gemstone (not a mineral) specimens identified by the Rock Identifier community.
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Likely bituminous coal
Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed visually
sedimentary
Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
Amber / Copal
Succinite (fossilized resin)
mineraloid
Sea glass (likely pale blue glass)
Human-made silicate glass, likely soda-lime glass; not a natural mineral or rock
mineral
Amber
Succinite (Fossilized Tree Resin)
gemstone
Fossil-bearing Sedimentary Rock
Sedimentum cum fossili
fossil
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Pearl; chiefly aragonite (CaCO₃) with conchiolin
gemstone
Chert (Cherty Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 composed primarily of quartz)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Flint)
Cryptocrystalline quartz (SiO2)
sedimentary
Dinosaur Claw Fossil
Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)
fossil
Jasper
Chalcedony (SiO2)
mineral
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)
Mineraloid (Organic Gemstone)
Fossilized Shark Tooth (Megalodon or Carcharocles species fragment)
Otodus megalodon / Carcharocles spp. (Apatite / Calcium Phosphate)
fossil
Chert Concretion
Microcrystalline Quartz (SiO2) in Carbonate Matrix
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert / Flint
Chert (SiO2)
sedimentary
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 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
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Chert (specifically Flint or Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Quartz (Smoky/Rose Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Pearl necklace (likely cultured pearls)
Pearl; chiefly aragonite (CaCO₃) in an organic conchiolin matrix
gemstone
Amber
Amber (Fossilized Tree Resin)
Mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper / Petrified Wood)
Microcrystalline Quartz (SiO2)
sedimentary