Mineral (Processed Metal)

Quartz vein in metamorphic rock

Crystalline Silicon Dioxide (SiO2) in Host Rock

Granite Pebble with Quartz Vein

Granite (Plutonic Igneous Rock) with Quartz (SiO2)

Limonite and Goethite

Limonite (hydrated iron(III) oxide-hydroxide) and Goethite (α-FeO(OH))

Gold Nugget / Flake

Native Gold (Au)

Biotite-rich mica schist

Mica schist, dominated by biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), with probable quartz and feldspar

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Bull Quartz

Quartz (Silicon Dioxide, SiO2)

Vanadinite

Pb5(VO4)3Cl

Native gold in quartz (probable)

Gold (Au), with quartz (SiO₂) matrix

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide

Gold Nugget

Native Gold (Au)

Bauxite (Aluminum Ore)

Hydrated aluminum oxides, primarily Al(OH)3, AlO(OH)

Silicon

Crystalline Silicon (Si)

Native Copper Nugget

Native Copper (Cu)

Slate

Foliated Metamorphic Rock (primarily composed of Muscovite, Chlorite, and Quartz)

Bauxite (Laterite Clay)

Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))

Rose Quartz and Lepidolite in Pegmatite

Crystalline Silicon Dioxide (SiO2) with Lithium-rich Mica (K(Li,Al)3(Al,Si)4O10(F,OH)2)

Iron Meteorite / Chondrite (Possible)

Extraterrestrial stony-iron or chondritic meteorite

Bismuth

Bismuth (Bi)

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

Likely galena-bearing rock fragment

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

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

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)

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

Chert (Commonly known as Flint)

Microcrystalline Quartz (SiO2)

Blue gemstone ring, likely sapphire

Corundum, Al₂O₃ (probable blue sapphire); surrounding stones may be diamonds or simulants

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)