Mineral (Refined Metal)

Magnetite (or Magnetic Iron Ore)

Magnetite (Fe3O4)

Black Tourmaline

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

Gold Nugget

Native Gold (Au)

Hematite

Iron(III) oxide (Fe2O3)

Magnetite

Magnetite (Fe3O4)

Arfvedsonite in Matrix

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]

Specularite (Specular Hematite)

Iron Oxide (Fe2O3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Hematite

Iron(III) oxide (Fe2O3)

Pyrite (on Quartz/Sulfide matrix)

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Shungite

Shungite (carbon-rich Precambrian mineraloid)

Gold Nugget

Native Gold (Au)

Black Pearl (Tahitian Pearl)

Aragonite / Calcite (CaCO3) with Conchiolin

Hematite

Hematite (Fe2O3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Native Gold (in the form of jewelry)

Gold (Au)

Chondrite Meteorite

Ordinary Chondrite (L or H Type)

Limonite (Pseudomorph after Pyrite/Marcasite)

Hydrated Iron Oxide (FeO(OH)·nH2O)

Botryoidal Hematite

Hematite (Iron(III) oxide, Fe2O3)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Gold Ore in Quartz

Auriferous Quartz (Gold: Au; Quartz: SiO2)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Gold

Gold (Native Au)

Limonite (Bog Iron)

Limonite (Hydrated iron(III) oxide-hydroxide) - FeO(OH)·nH2O

Gold Nugget

Native Gold (Au)

Pyrite

Iron Sulfide (FeS2)

Iron-Nickel Meteorite fragment

Siderite (meteoritic iron), composed primarily of Kamacite (α-(Fe,Ni)) and Taenite (γ-(Fe,Ni))

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Hematite Pebble

Hematite (Fe2O3)

Tiger Iron / Banded Iron Formation

Banded Iron Formation (SiO2 with Fe2O3 and FeOOH)

Crushed Stone / Gravel

Aggregatus saxum (variable mineral composition)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Lepidolite

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Agate

Banded Chalcedony (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Tiger Iron

Tiger Iron (Hematite, Red Jasper, and Tiger's Eye)