Mineral (Refined Metal)

Weathered breccia or hydrothermal vein rock

Silicified polymict breccia, likely quartz–iron-oxide breccia

Lepidolite in Mica Schist

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Quartz Vein in Matrix (Gneiss/Schist)

Silicon Dioxide (SiO2) in Metamorphic Rock Matrix

Serpentinite

Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Likely galena-bearing rock fragment

Galena (PbS), possibly in a quartz- or carbonate-rich matrix

Gold Ore

Gold-bearing Quartz (Native Gold, Au)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)

Polished banded agate pendant

Agate, microcrystalline quartz (SiO₂), a chalcedony variety

Small metallic meteorite fragment (probable stony-iron or iron meteorite)

Unclassified meteoritic material; exact classification requires chemical and petrographic testing

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

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Aura Quartz

Silicon dioxide coated with titanium and other metals (SiO2)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Zinc Ore (Sphalerite in Matrix)

Sphalerite (Zn,Fe)S within a carbonate or silicate host rock

Bauxite

Aluminium ore consisting largely of the minerals gibbsite Al(OH)3, boehmite γ-AlO(OH) and diaspore α-AlO(OH)

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

Milky Quartz in Gneiss

Quartzite / Foliated Gneiss containing SiO2

Sapphire in a ring

Corundum (Al2O3)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Industrial Diamond (Bort or Boart)

Diamond (pure Carbon, C)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Native Copper

Native Copper (Cu)

Galena-bearing ore (probable)

Galena, lead sulfide (PbS), possibly with sphalerite or metallic sulfides

Galena

Lead sulfide (PbS)

Opalite

Synthetic glass (SiO2 + metal additions)

Milky Quartz

Silicon Dioxide (SiO2)

Native Copper

Native Copper (Cu)

Beryl (Emerald Variety)

Beryllium Aluminum Silicate (Be3Al2(SiO3)6)

Gold-bearing quartz or ironstone fragment

Quartz (SiO₂) with possible native gold and iron oxides

Diamond (in a gold setting)

Carbon (C)

Granite

Intrusive Igneous Rock

Granite

Intrusive Igneous Rock (Mainly Quartz, Feldspar, and Mica)

Quartz Vein in Host Rock

Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)

Bauxite

Aluminium ore / Hydrated aluminium oxides (AlOx(OH)3-2x)

Quartz and Iron Oxide

Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Native gold-bearing sulfide specimen

Native gold (Au), likely intergrown with pyrite (FeS₂) or chalcopyrite (CuFeS₂)

Bauxite

Aluminum ore / Hydrated aluminum oxides

Granite

Granite (Plutonic Igneous Rock)