Mineral, Metal (Element)

Emerald in Matrix

Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities

Possible weathered iron-rich rock or slag fragment

Indeterminate; likely limonite/goethite-bearing material, possibly iron slag

Gossan (Limonite/Ironstone)

Hydrated Iron Oxide (FeO(OH)·nH2O)

Quartz Vein in Host Rock (Gabbro or Basalt)

Silicon Dioxide (SiO2) with Mafic Silicates

Granite Boulder

Felsic Intrusive Igneous Rock

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Granite (Felsic Plutonic Rock)

Pyrite

Iron Disulfide (FeS2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Likely weathered metallic mineral or slag fragment

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

Indeterminate metallic mineral fragments

Possibly pyrite, chalcopyrite, or metallic sulfide-bearing rock

Limonite and Goethite encrusted Quartz (Iron-stained Gossan)

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

Granite

Phaneritic Felsic Igneous Rock

Native Copper

Native Copper (Cu)

Gold Ore in Quartz

Native Gold (Au) in Quartz (SiO2) matrix

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

Pyrite

Iron Sulfide (FeS2)

Pallasite Meteorite (Sliced and Polished)

Pallasite (Iron-Nickel Matrix with Olivine crystals)

Peacock Ore (Chalcopyrite)

Chalcopyrite (CuFeS2)

Sandstone (Quartzose)

Arenite (predominantly SiO2)

Mica-bearing quartz rock (likely pegmatite)

Quartz–feldspar–mica pegmatite; dark mica is probably biotite, possibly muscovite or chlorite

Lepidolite

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

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Lepidolite

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

Milky Quartz

Silicon Dioxide (SiO2)

Zircon

Zircon (Zirconium Silicate - ZrSiO4)

Goethite / Limonite Gossan

Hydrated Iron Oxide (FeO(OH))

Granite

Granite (felsic intrusive igneous rock)

Limonite-stained Quartz

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

Granite

Intrusive Igneous Rock

Granite

Intrusive igneous rock

Opalite (Man-made Glass)

Synthetic Opalised Glass

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 inclusions)

Pyrite in Matrix

Iron Sulfide (FeS2)

Pink Granite

Granite (Phaneritic Quartz-Feldspar rock)

Granite

Felsic intrusive igneous rock

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) vein cutting through host rock

Orange Calcite with Siderite/Iron Oxide Coating

Calcium Carbonate (CaCO3)

Gold

Native Gold (Au)