Mineral (Refined Metal)

Pyrite (on Quartz matrix)

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Magnetite / Iron Ore (likely Hematite-Magnetite mix)

Magnetite (Fe3O4)

Gold and Diamond

Native Gold (Au) and Diamond (C)

Pyrite

Iron Sulfide (FeS2)

Silicon Carbide (Carborundum)

Moissanite (SiC)

Hematite

Iron(III) oxide (Fe2O3)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Galena

Lead(II) sulfide (PbS)

Limonite with Hematite

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Gold (in Opaque Matrix/Jewelry)

Native Gold (Au)

Pyrite

Iron Sulfide (FeS2)

Silver (Native Element / Alloy)

Silver (Ag)

Specular Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Ferric oxide (Fe2O3)

Gold Nugget

Native Gold (Au)

Hematite (Iron Ore)

Hematite (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Pyrite (Iron Pyrite)

Iron Sulfide (FeS2)

Gold Ore (in Quartz/Sulfide matrix)

Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)

Pyrite

Iron Sulfide (FeS2)

Peacock Ore (Chalcopyrite with acid treatment)

Copper Iron Sulfide (CuFeS2)

Quartz with Arsenopyrite

Silicon Dioxide (SiO2) with Iron Arsenic Sulfide (FeAsS)

Smoky Quartz with Siderite and Pyrite

Silicon Dioxide (SiO2) with Ferrous Carbonate (FeCO3) and Iron Sulfide (FeS2)

Gold Nugget

Native Gold (Au)

Pyrite

Iron Disulfide (FeS2)

Hematite

Iron(III) oxide (Fe2O3)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Gold

Native Gold (Au)

Gold Ore

Native Gold in Quartz (Au)

Bronzite

Enstatite (var. Bronzite), (Mg,Fe)SiO3

Pyrite

Iron Sulfide (FeS2)

Pyrite (Fool's Gold) in Matrix

Iron Sulfide (FeS2)

Silver (Morgan Dollar)

Native Silver (Ag) - 90% Silver, 10% Copper alloy

Magnetite (in matrix)

Magnetite (Fe3O4)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Hematite

Iron(III) oxide (Fe2O3)