Mineral (Processed Metal)

Silver Nugget

Native Silver (Ag)

Galena

Lead(II) sulfide (PbS)

Gold Nugget

Native Gold (Au)

Copper Ore

Native Copper (Cu) often found with Chalcocite (Cu2S) or Bornite (Cu5FeS4)

Granite

Felsic intrusive igneous rock

Iron-stained Quartz (Gossan/Limonite-coated Quartz)

Silicon Dioxide (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Vein Rock

Quartz (Silicon Dioxide, SiO2)

Granite

Intrusive igneous rock primarily composed of quartz, alkali feldspar, and plagioclase

Granite

Felsic intrusive igneous rock

Granite

Intrusive igneous rock

Gold-bearing Quartz Ore

Auriferous Quartz (SiO2 with Au)

Hematite bead bracelet

Hematite (Fe₂O₃), likely polished or magnetically enhanced beads

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Matrix (Gneiss/Schist)

Silicon Dioxide (SiO2) in Metamorphic Rock Matrix

Lepidolite in Mica Schist

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

Serpentinite

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

Native Copper

Native Copper (Cu)

Quartzite

Quartzite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Granite Pebble with Quartz Vein

Granite (Plutonic Igneous Rock) with Quartz (SiO2)

Quartz vein in metamorphic rock

Crystalline Silicon Dioxide (SiO2) in Host Rock

Limonite and Goethite

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

Bismuth

Bismuth (Bi)

Bismuth

Bismuth (Bi)

Native Copper (Penny specimen)

Native Copper (Cu)

Green Glass Cullet / Recycled Glass

Amorphous Silicon Dioxide (SiO2) with various metal oxides

Sandstone (Whetstone/Sharpening Stone)

Siliciclastic Sandstone (SiO2 dominant)

Gold Nugget / Flake

Native Gold (Au)

Granite

Felsic intrusive igneous rock

Chromite

Chromite (FeCr2O4)

Green Schist

Greenschist (Chlorite Schist)

Beryl (Aquamarine)

Be3Al2Si6O18

Amethyst (in jewelry)

Silicon Dioxide (SiO2) with iron impurities

Quartz-rich metallic sulfide ore (probable pyrite-bearing rock)

Pyrite, FeS₂, in a quartz-rich host; exact identification is uncertain from the image

Native Copper Nugget

Native Copper (Cu)

Rose Quartz and Lepidolite in Pegmatite

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

Bauxite

Bauxite (mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)