Mineral (Iron Ore)

Copper Ore (Malachite and Limonite bearing rock)

Copper-bearing rock with secondary copper minerals

Hematite Pebble

Iron(III) oxide (Fe2O3)

Ironstone Concretion / Limonite Node

Goethite and Limonite (FeO(OH) nH2O)

Gossan (with Limonite and Hematite)

Gossanous iron-oxide rock (Fe2O3 · nH2O)

Magnetite with Quartz

Magnetite (Fe3O4)

Ironstone Concretion (Iron Nodule)

Hydrated Iron Oxide Concretion (predominantly Goethite, Α-FeO(OH), and Hematite, Fe2O3)

Limonite on Sandstone

Iron Oxyhydroxide (FeO(OH)·nH2O) on Quartz Sandstone

Hematite

Iron(III) oxide (Fe2O3)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Magnetite

Magnetite (Iron(II,III) oxide, Fe3O4)

Siderite Concretion

Ironstone (Siderite) Concretion, FeCO3

Hematite (Botryoidal/Kidney Ore)

Iron(III) oxide (Fe2O3)

Ironstone (Limonitic Sandstone)

Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)

Weathered iron-rich rock, possibly meteorite

Uncertain; likely goethite/hematite-rich material, with meteorite possibility

Hematite

Hematite (Fe₂O₃), likely a polished specular hematite palm stone

Goethite–limonite ironstone

Goethite (α-FeO(OH)) with limonite, hydrated iron oxides, and possible quartz

Hematite

Hematite (Fe2O3)

Hematite

Iron Oxide (Fe2O3)

Banded iron formation (BIF) fragment

Metamorphosed iron formation; alternating hematite/magnetite and chert (SiO₂) layers

Limonite Stained Basalt

Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)

Limonite Concretion

FeO(OH)·nH2O (Hydrated Iron Oxide)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Specular Hematite with Pyrite

Iron Oxide (Fe2O3) with Iron Sulfide (FeS2)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Pyrite

Iron Sulfide (FeS2)

Likely iron-rich sandstone or ironstone

Ferruginous sandstone/ironstone; exact identification is uncertain from the photograph

Chrysocolla

Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·n(H2O)

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Limonite and Goethite encrusted Chert/Ironstone

Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)

Polished magnetite-rich ironstone (possible magnetite pebble)

Magnetite, Fe₃O₄; possibly magnetite-bearing basalt or ironstone

Pyrite

Iron Pyrite (FeS2)

Small ironstone pebble (likely limonite/goethite-rich concretion)

Goethite, α-FeO(OH), with possible limonite and quartz or clay impurities

Hematite

Iron(III) oxide (Fe2O3)

Hematite (Oolitic or Earthy variety)

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Specular Hematite

Specularite (Iron Oxide, Fe2O3)