Mineral (Refined Metal)

Native Gold in Quartz

Native Gold (Au)

Pyrite

Iron Disulfide (FeS2)

Gold Nugget

Native Gold (Au)

Pyrite

Iron Sulfide (FeS2)

Gold Nugget

Native Gold (Au)

Bixbyite on Rhyolite

Bixbyite (Mn2+,Fe3+)2O3

Black Tourmaline

Schorl (Sodium Iron Aluminum Borosilicate Hydroxide)

Native Copper

Native Copper (Cu)

Earthy Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Bort or Carbonado

C - Polycrystalline Diamond

Gold Ore / Native Gold

Native Gold (Au)

Native Gold (in Jewelry form)

Gold (Au)

Gold Flake / Placer Gold

Native Gold (Au)

Pyrite

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Gold Nugget

Native Gold (Au)

Pyrite in Shale

Iron Disulfide (FeS2) in Sedimentary Shale

Magnetite (likely in Hematite or Ironstone)

Magnetite (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Magnetite Sand (Black Sand)

Magnetite (Fe3O4)

Muscovite Mica (with Quartz)

Muscovite (KAl2(AlSi3O10)(OH)2)

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Specular Hematite Geode/Nodule

Specularite (Polycrystalline Hematite), Fe2O3

Hematite

Iron(III) oxide (Fe2O3)

Pyrite

Iron Disulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Hematite

Iron(III) oxide (Fe2O3)

Moissanite

Silicon Carbide (SiC)

Gold Nugget

Native Gold (Au)

Hematite

Iron(III) oxide (Fe2O3)

Limonite (Iron Ore)

Goethite and related iron hydroxides (FeO(OH)·nH2O)

Pyrite

Iron Sulfide (FeS2)

Hematite

Iron(III) oxide (Fe2O3)

Pyrite in Matrix (likely Quartz or Coal)

Iron Sulfide (FeS2)

Gold Nugget

Native Gold (Au)

Hematite

Iron(III) oxide (Fe2O3)

Pyrite

Iron Disulfide (FeS2)

Pyrite in Matrix

Iron Sulfide (FeS2)

Limonite (Iron Stone/Goethite)

Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))

Hematite

Iron(III) oxide (Fe2O3)

Galena

Lead(II) sulfide (PbS)