Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Silicified oyster fossil
Fossil oyster shell, commonly Ostrea or Crassostrea, replaced or encrusted by chalcedony/quartz
fossil
Geode (Small unopened nodule)
Quartz-lined nodule (SiO2)
sedimentary
Satin Spar (often sold as Selenite)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Glauconite Sandstone
Glauconitic Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Tumbled turquoise cabochon
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly stabilized or dyed material
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 predominantly)
sedimentary
Sandstone (Pebble)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Blue-green faceted gemstone, likely turquoise or treated turquoise
Turquoise: hydrated copper–aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification is uncertain from the image
gemstone
Coal (Anthracite)
Anthracite coal (Carbon C)
sedimentary
Sandstone (Yellow/Tan Sandstone)
Arenite (primarily Quartz, SiO2)
sedimentary
Chert (Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Polished malachite
Malachite (Cu₂CO₃(OH)₂), a hydrated copper carbonate hydroxide
mineral
Turquoise cabochon ring
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Polished malachite slab
Malachite, Cu₂CO₃(OH)₂; likely polished and possibly resin-stabilized
mineral
Chert (Gravel Fragment)
Silicon dioxide (SiO2)
sedimentary
White quartz geode nodule
Quartz (SiO₂), likely a quartz-lined geode or vug in a host rock
mineral
Turquoise cabochon jewelry
Turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Anthracite Coal
Anthracite (Metamorphosed Carbon)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Red Sandstone
Arenite (typically with iron oxide/hematite cement)
sedimentary
Sandstone
Arenite (SiO2 principal composition)
sedimentary
Asphalt aggregate (crushed stone in bitumen)
Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen
sedimentary
Anthracite Coal
Anthracite
sedimentary
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Gneiss
Banded Gneiss
metamorphic
Shale (possibly Carbonaceous or Oil Shale)
Argillaceous Sedimentary Rock
sedimentary
Quartz geode fragment
Mostly crystalline quartz (SiO₂), likely with chalcedony and minor iron-oxide staining
mineral
Bituminous Coal
Bituminous coal (Carbonaceous sedimentary rock)
sedimentary
Mica Schist (with Muscovite)
Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Chert (Quartz Variety)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Yellow Chalcedony
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with FeO(OH) impurities)
sedimentary
Ironstone Concretion / Hematite Nodules
Ferruginous Sedimentary Rock (primarily Hematite Fe2O3 and Goethite FeO(OH))
sedimentary