Mineral (Refined Metal)

Amethyst cabochon jewelry

Amethyst, purple variety of quartz (SiO₂)

Gold-Bearing Quartz Ore

Crystalline Silicon Dioxide (SiO2) with Trace Aurum (Au)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Faceted transparent gemstone, likely glass or cubic zirconia

Uncertain from image; possible cubic zirconia (zirconium dioxide, ZrO₂) or glass imitation

Clear quartz crystal pendant

Quartz (silicon dioxide, SiO₂)

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Granite

Intrusive Igneous Rock

Copper Ore

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

Ruby (set in a ring; possibly synthetic or imitation)

Corundum, Al₂O₃; red color is typically caused by chromium

Beryl (Aquamarine)

Be3Al2Si6O18

Granite

Felsic intrusive igneous rock

Beryl (Aquamarine)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Amethyst cabochon ring

Amethyst, purple quartz (SiO₂), colored primarily by iron-related defects and irradiation

Pyrite

Iron Sulfide (FeS2)

Quartz-bearing pyrite–chalcopyrite specimen

Pyrite (FeS₂), likely chalcopyrite (CuFeS₂), with quartz (SiO₂)

Bauxite

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

Granite

Felsic intrusive igneous rock

Granite

Intrusive Igneous Rock

Diamond-set letter “L” jewelry piece

Diamond (crystalline carbon, C) set in a metal mount; the metal is not identifiable from the image

Gossan (Iron Hat)

Hydrous Iron Oxides (predominantly Goethite FeO(OH) and Limonite)

Aura Quartz

Silicon Dioxide (SiO2) with Titanium/Metal vapor coating

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxides

Moss Agate

Silicon dioxide (SiO2) with inclusions

Granite

Intrusive Igneous Rock

Gossan (Limonite/Goethite)

Hydrated iron oxides (primarily FeO(OH)·nH2O)

Mineral Sand (Heavy Mineral Sand Concentrate)

Placer deposit concentrate containing minerals such as ilmenite, rutile, zircon, and magnetite

Quartz Pebble

Silicon Dioxide (SiO2)

Granite

Felsic intrusive igneous rock

Red garnet cabochon-style earrings

Likely almandine garnet (Fe₃Al₂(SiO₄)₃); the image alone cannot confirm the stone or whether it is natural or synthetic.

Granite

Felsic intrusive igneous rock

Granite

Felsic intrusive igneous rock

Jasper

Silicon dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Gold-bearing Quartz Ore

Auriferous Quartz (SiO2 with Au)

Carnelian cabochon earrings

Carnelian, a translucent orange variety of chalcedony (microcrystalline SiO₂)

Sandstone (Whetstone/Sharpening Stone)

Siliciclastic Sandstone (SiO2 dominant)

Native Copper

Native Copper (Cu)

Polished raw copper-bearing rock, likely cuprite–malachite ore

Copper oxides and carbonates, likely cuprite (Cu₂O) with malachite (Cu₂CO₃(OH)₂); exact identification requires testing