Gold Nugget / Flake
Native Gold (Au)
mineral
Category
Mineral, Metal (Element)
Browse mineral, metal (element) specimens identified by the Rock Identifier community.
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Chromite
Chromite (FeCr2O4)
mineral
Bismuth
Bismuth (Bi)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz in Gneiss
Quartzite / Foliated Gneiss containing SiO2
metamorphic
Biotite-rich mica schist
Mica schist, dominated by biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), with probable quartz and feldspar
metamorphic
Bull Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Man-made Synthetic Material (Plastic/Composite)
Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)
Non-geological / Synthetic
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
Native gold in quartz (probable)
Gold (Au), with quartz (SiO₂) matrix
mineral
Sapphire in a ring
Corundum (Al2O3)
mineral
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)
sedimentary
Iron Meteorite / Chondrite (Possible)
Extraterrestrial stony-iron or chondritic meteorite
meteorite
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
Bauxite (Laterite Clay)
Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
sedimentary
Banded Calcite (Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Bauxite
Aluminium ore / Hydrated aluminium oxides (AlOx(OH)3-2x)
sedimentary
Polished banded agate pendant
Agate, microcrystalline quartz (SiO₂), a chalcedony variety
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Gold Nugget
Native Gold (Au)
mineral
Copper
Native Copper (Cu)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Native Copper
Native Copper (Cu)
mineral
Granite
Intrusive Igneous Rock (Mainly Quartz, Feldspar, and Mica)
igneous
Galena-bearing ore (probable)
Galena, lead sulfide (PbS), possibly with sphalerite or metallic sulfides
mineral
Galena
Lead sulfide (PbS)
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
Native Copper
Native Copper (Cu)
mineral
Gold Ore
Gold-bearing Quartz (Native Gold, Au)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Standing Liberty Quarter (Silver Specimen)
Native Silver alloy (Ag with Cu traces)
mineral
Quartz and Iron Oxide
Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions
mineral
Porphyritic basalt or weathered volcanic rock
Basalt, likely plagioclase–pyroxene rock with possible olivine; exact identification requires testing
igneous
Native gold-bearing sulfide specimen
Native gold (Au), likely intergrown with pyrite (FeS₂) or chalcopyrite (CuFeS₂)
mineral
Beryl (Emerald Variety)
Beryllium Aluminum Silicate (Be3Al2(SiO3)6)
mineral
Quartz Vein in Host Rock
Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)
metamorphic
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral