Unknown Rock Fragment
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Industrial Byproduct (Anthropogenic Rock)
Browse industrial byproduct (anthropogenic rock) specimens identified by the Rock Identifier community.
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Opalite
Synthetic Opalite Glass / Opalized Glass
gemstone
Fossilized Shell Impression / Siltstone Fossil
Bivalvia / Brachiopoda mold in Siltstone
fossil
Basalt Pebble
Extrusive Igneous Rock / Basalt
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Aphanitic Mafic Volcanic Rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Crushed Granite and Basalt
Phaneritic Igneous Rock / Aphanitic Igneous Rock
igneous
Serpentine
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Granodiorite (Gneissic texture)
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
igneous
Basalt (Vesicular)
Basalt (Extrusive Volcanic Rock)
igneous
Granodiorite (Weathered)
Granodiorite
igneous
Fossil Snail
Gastropoda fossil
fossil
Desert Rose (Baryte or Selenite variant)
Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions
mineral
Quartz-veined Metamorphic Pebble
Silicate-rich metamorphic rock with quartz veins (SiO2)
metamorphic
Amethyst
Quartz (SiO2) with trace iron impurities
Mineral
Opalite
Synthetic Glass (typically Silica/Magnesium based with metal additives)
mineral
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Asphalt (Bituminous pavement fragment)
Artificial conglomerate / Bitumen-Aggregate mixture
sedimentary
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Tumbled blue stone, likely sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue calcite or dyed material
mineral
Likely tumbled jasper or iron-rich chert
Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing
mineral
Polished tiger’s-eye
Tiger’s-eye, a chatoyant quartz variety; SiO₂ with fibrous pseudomorphic crocidolite/goethite inclusions
mineral
Polished ocean jasper (orbicular jasper), likely
Silica-rich microcrystalline quartz/chalcedony aggregate, commonly with feldspar, epidote, and iron oxides; composition varies
igneous
Blue faceted gemstones, likely blue sapphire
Corundum (Al₂O₃), blue varieties colored chiefly by iron and titanium
gemstone
Tumbled sodalite (probable)
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-dyed jasper or lapis lazuli
mineral
Carved quartz skull
Quartz (silicon dioxide, SiO₂)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Black Tourmaline
Schorl (NaFe3Al6(Si6O18)(BO3)3(OH,F)4)
mineral
Bauxite
Aluminium ore / Hydrated aluminium oxides (AlOx(OH)3-2x)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Yellow Sapphire
Corundum (Al2O3 with trace amounts of iron)
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Garnet (Almandine)
Fe3Al2(SiO4)3
mineral
Diamond
C (Carbon)
gemstone
Raw Ruby (Corundum)
Corundum (Aluminum Oxide, Al2O3)
mineral
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Garnet
Silicate mineral group (often Pyrope or Almandine in this color range)
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
mineral