Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Mineral Based Human Made Alloy
Browse mineral based human made alloy specimens identified by the Rock Identifier community.
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Amethyst
Amethyst (Silicon Dioxide with iron impurities), SiO2
mineral
Polished turquoise
Turquoise — hydrated copper–aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)
Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)
mineral (synthetic)
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Asphalt Concrete (Bituminous Pavement)
Aggregates in Bitumen Matrix
Technogenic / Anthropogenic Pavement Material
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Chert (Arrowhead or Flake)
Microcrystalline quartz (SiO2)
sedimentary
Turquoise (with Hematite)
CuAl6(PO4)4(OH)8·4H2O
mineral
Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Granite Glacial Erratic
Intrusive Phaneritic Felsic Rock (Granite)
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Fossil Shark Tooth
Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna
fossil
Sandstone Geode (Unbroken)
Siliciclastic sedimentary rock (primarily Quartz)
sedimentary
Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Chert (Chert Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Pink/red faceted gemstone, likely synthetic ruby or pink sapphire
Corundum, aluminum oxide (Al₂O₃); likely lab-grown or treated material
gemstone
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Turquoise in Matrix
Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Wallboard/Drywall (Gypsum-based)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
sedimentary
Slag (Industrial Glass/Glassy Rock)
Anthropogenic Vitreous Material
igneous
Gold Ore (in Quartz/Gossan matrix)
Native Gold (Au) in Limonite/Quartz matrix
mineral
Blue-beaded gemstone jewelry, likely lapis lazuli or dyed blue agate
Uncertain from the image; possible lazurite-bearing lapis lazuli (Na₃Ca(Si₃Al₃)O₁₂S) or blue chalcedony (SiO₂)
gemstone
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Clear/Smoky Geode fragment)
Silicon Dioxide (SiO2)
mineral
Sandstone River Pebble
Arenite (SiO2 predominantly)
sedimentary
Turquoise
Hydrous phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Silver (Native Element)
Silver (Ag) in an alloy of 90% Silver and 10% Copper
mineral
Uncertain small metallic-looking mineral/rock fragment
Indeterminate; possibly galena-bearing rock or metallic slag
mineral
Graphite
Graphite (Carbon, C)
mineral
Gold Nugget
Native Gold (Au)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
sedimentary
Coquina
Coquina (Biogenic Limestone / CaCO3)
sedimentary
Halite
Sodium chloride (NaCl)
mineral
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Coquina
Bioclastic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Turquoise in Matrix
Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O
mineral