Quartz–calcite sulfide-bearing mineral specimen
Quartz (SiO₂) with likely calcite (CaCO₃) and iron sulfides, possibly pyrite (FeS₂); exact species requires testing
mineral
Category
Metal (Elemental Mineral)
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Jasper
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Mica-rich metamorphic rock, likely schist
Quartz–mica schist; commonly quartz with muscovite and/or biotite mica
metamorphic
Quartz vein in metamorphic rock
Crystalline Silicon Dioxide (SiO2) in Host Rock
metamorphic
Granite Pebble with Quartz Vein
Granite (Plutonic Igneous Rock) with Quartz (SiO2)
igneous
Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating
mineral
Diamond-set letter “L” jewelry piece
Diamond (crystalline carbon, C) set in a metal mount; the metal is not identifiable from the image
gemstone
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Chromite
Chromite (FeCr2O4)
mineral
Gold Nugget / Flake
Native Gold (Au)
mineral
Bismuth
Bismuth (Bi)
mineral
Decorative gemstone-chip jewelry (likely turquoise, coral, and assorted beads)
Predominantly turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; other pieces appear to be dyed coral or red stone, and possibly shell/metal components
gemstone
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
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz in Gneiss
Quartzite / Foliated Gneiss containing SiO2
metamorphic
Native gold in quartz (probable)
Gold (Au), with quartz (SiO₂) matrix
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
Man-made Synthetic Material (Plastic/Composite)
Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)
Non-geological / Synthetic
Iron Meteorite / Chondrite (Possible)
Extraterrestrial stony-iron or chondritic meteorite
meteorite
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)
sedimentary
Sapphire in a ring
Corundum (Al2O3)
mineral
Bauxite (Laterite Clay)
Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
sedimentary
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
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
Granite
Intrusive Igneous Rock (Mainly Quartz, Feldspar, and Mica)
igneous
Copper
Native Copper (Cu)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Native Copper
Native Copper (Cu)
mineral
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
Gold Ore
Gold-bearing Quartz (Native Gold, Au)
mineral
Native Copper
Native Copper (Cu)
mineral