Biotite-rich mica schist
Mica schist, dominated by biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), with probable quartz and feldspar
metamorphic
Category
Mineral (Refined Metal)
Browse mineral (refined metal) specimens identified by the Rock Identifier community.
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Man-made Synthetic Material (Plastic/Composite)
Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)
Non-geological / Synthetic
Bull Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Faceted brown gemstone in a silver-colored setting
Likely smoky quartz (SiO₂), but the photo cannot reliably distinguish it from other brown gems or glass
gemstone
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)
sedimentary
Sapphire in a ring
Corundum (Al2O3)
mineral
Bauxite
Aluminium ore / Hydrated aluminium oxides (AlOx(OH)3-2x)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Native Copper
Native Copper (Cu)
mineral
Multi-stone gemstone ring
Likely faceted blue topaz or synthetic blue stone with clear stones, possibly cubic zirconia or diamond; metal setting appears silver-colored alloy
gemstone
Native gold in quartz (probable)
Gold (Au), with quartz (SiO₂) matrix
mineral
Iron Meteorite / Chondrite (Possible)
Extraterrestrial stony-iron or chondritic meteorite
meteorite
Banded Calcite (Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Silicon
Crystalline Silicon (Si)
mineral
Bauxite (Laterite Clay)
Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
sedimentary
Galena-bearing ore (probable)
Galena, lead sulfide (PbS), possibly with sphalerite or metallic sulfides
mineral
Galena
Lead sulfide (PbS)
mineral
Granite
Intrusive Igneous Rock (Mainly Quartz, Feldspar, and Mica)
igneous
Native Copper
Native Copper (Cu)
mineral
Native gold-bearing sulfide specimen
Native gold (Au), likely intergrown with pyrite (FeS₂) or chalcopyrite (CuFeS₂)
mineral
Porphyritic basalt or weathered volcanic rock
Basalt, likely plagioclase–pyroxene rock with possible olivine; exact identification requires testing
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gold Ore
Gold-bearing Quartz (Native Gold, Au)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Gold Nugget
Native Gold (Au)
mineral
Quartz and Iron Oxide
Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions
mineral
Industrial Diamond (Bort or Boart)
Diamond (pure Carbon, C)
mineral
Zinc Ore (Sphalerite in Matrix)
Sphalerite (Zn,Fe)S within a carbonate or silicate host rock
mineral
Quartz Vein in Host Rock
Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)
metamorphic
Beryl (Emerald Variety)
Beryllium Aluminum Silicate (Be3Al2(SiO3)6)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Titanium Quartz (Aura Quartz)
Silicon Dioxide (SiO2) treated with Titanium
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Plutonic Igneous Rock)
igneous
Standing Liberty Quarter (Silver Specimen)
Native Silver alloy (Ag with Cu traces)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Hollow geode or vesicular volcanic rock
Likely quartz-lined basaltic/andesitic vesicle; exact identification requires testing
igneous
Tiger Iron
Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral