Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Category
Mineraloid (Man Made Glass)
Browse mineraloid (man made glass) specimens identified by the Rock Identifier community.
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Chert (varietal Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Quartz (Microcrystalline/Chert)
Silicon Dioxide (SiO2)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Blue Chalcedony Cube
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna
fossil
Cobalt Blue Sea Glass
Amorphous Silica Glass (SiO2 + CoO)
mineraloid / anthropogenic material
Common Opal with Host Rock
Opal (Hydrated silica, SiO2·nH2O)
mineral
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Precious Opal
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Banded Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Corundum (Ruby variety)
Aluminium oxide (Al2O3)
mineral
Diamond (as set in a gold ring)
Carbon (C)
mineral
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Moldavite
Silica glass with small amounts of aluminum, iron, and other elements
Mineraloid / Tektite
River Pebbles (Chert and Quartzite)
Sedimentary Clastic Rock (Silica-rich)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pearls (likely freshwater cultured pearls)
Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin
gemstone
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Sea Glass (Frosted Glass)
Amorphous Silica (SiO2) with various metal oxide impurities
Man-made material (Anthro-lithic product)
Chert (often called Flint or Agate nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Flint (or Chert with cortex)
Silicon dioxide (SiO2)
sedimentary
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Diamond (in a cluster setting)
Crystallized Carbon (C)
mineral
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Amethyst (or Light Amethyst / Rose Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Sea Glass (Turquoise/Aqua)
Amorphous Silica (SiO2) with transition metal dopants
Anthropogenic (Man-made material processed by nature)