Metal (Elemental Mineral)

Pyrite

Iron Disulfide (FeS2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Beryl (Aquamarine)

Beryllium aluminum silicate (Be3Al2Si6O18)

Quartz Vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Igneous/Metamorphic Matrix

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Limonite and Goethite encrusted Quartz (Iron-stained Gossan)

FeO(OH)·nH2O (Limonite) / FeO(OH) (Goethite) on SiO2 (Quartz)

Gossan (Limonite/Ironstone)

Hydrated Iron Oxide (FeO(OH)·nH2O)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Chalcopyrite on Quartz

Copper Iron Sulfide (CuFeS2)

Granite Boulder

Felsic Intrusive Igneous Rock

Granite

Felsic intrusive igneous rock

Native Copper

Native Copper (Cu)

Granite

Granite (Felsic Plutonic Rock)

Blue Sapphire and Diamond (Set in Metal)

Corundum (Al2O3) and Diamond (C)

Cream Marble (Speckled)

Metamorphosed Limestone (mainly CaCO3)

Pyrite

Iron Sulfide (FeS2)

Likely weathered metallic mineral or slag fragment

Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag

Milky Quartz

Silicon Dioxide (SiO2)

Emerald in Matrix

Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities

Gold Ore in Quartz

Native Gold (Au) in Quartz (SiO2) matrix

Granite

Phaneritic Felsic Igneous Rock

Pallasite Meteorite (Sliced and Polished)

Pallasite (Iron-Nickel Matrix with Olivine crystals)

Peacock Ore (Chalcopyrite)

Chalcopyrite (CuFeS2)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Lepidolite

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

Lepidolite

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

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Zircon

Zircon (Zirconium Silicate - ZrSiO4)

Bismuth Crystal

Bismuth (Bi)

Goethite / Limonite Gossan

Hydrated Iron Oxide (FeO(OH))

Granite

Granite (felsic intrusive igneous rock)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 inclusions)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) vein cutting through host rock

Pyrite in Matrix

Iron Sulfide (FeS2)

Aura Quartz (Titanium/Bismuth Coated)

Silicon Dioxide (SiO2) with metallic vapor coating

Gold Nugget

Native Gold (Au)

Sandstone (Quartzose)

Arenite (predominantly SiO2)

Gold

Native Gold (Au)

Granite

Intrusive Igneous Rock