Graphite
Graphite (Carbon, C)
mineral
Category
Mineral (Organic Gemstone)
Browse mineral (organic gemstone) specimens identified by the Rock Identifier community.
Learn about Mineral (Organic Gemstone) in the encyclopedia
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Chert (Brown variety / Common Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Chert (Cherty Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Chert (SiO2)
sedimentary
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Chert (and its variety Flint)
Silicon dioxide (SiO2) / Microcrystalline quartz
sedimentary
Chert (variations like Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Amber in Matrix
Succinite (Carbon-based organic polymer)
Organic (Sedimentary context)
Amber
Succinite (fossilized resin)
Mineral
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Tree Agate (also known as Dendritic Agate)
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
mineral
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Fossil tooth
Mineralized vertebrate tooth; exact animal and species cannot be determined from the image
fossil
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Moss Agate
Chalcedony (SiO2) with inclusions of hornblende or chlorite
mineral
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Flint Pebbles)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Flint/chert nodule with a weathered cortex
Microcrystalline quartz (SiO₂), likely flint or dark chert
sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron inclusions - SiO2)
Sedimentary/Metamorphic
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
Fossil-bearing Sedimentary Rock
Sedimentum cum fossili
fossil
Amber
Succinite (Fossilized Tree Resin)
gemstone
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Pearl; chiefly aragonite (CaCO₃) with conchiolin
gemstone
Sandstone
Arenite (SiO2 composed primarily of quartz)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Cherty Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Dinosaur Claw Fossil
Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)
fossil
Jasper
Chalcedony (SiO2)
mineral
Chert (Flint)
Cryptocrystalline quartz (SiO2)
sedimentary
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