Mineral (Iron Ore)

Weathered iron-rich rock (probable limonite/goethite)

Limonite: hydrated iron oxides, chiefly goethite (FeO(OH)) and hematite (Fe₂O₃)

Limonite (Iron Ore)

Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)

Hematite

Iron(III) oxide (Fe2O3)

Limonite (Yellow Ochre)

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

Iron (Hematite variety)

Iron (Fe) / Hematite (Fe2O3)

Chalcopyrite (Peacock Ore)

Copper Iron Sulfide (CuFeS2)

Limonite (Iron Ore)

Hydrated ferric oxide (FeO(OH)·nH2O)

Goethite

Goethite (FeO(OH))

Limonite (Iron Ore/Hydrated Iron Oxide)

Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))

Limonite (Ironstone)

Limonite (FeO(OH)·nH2O)

Limonite (Iron Ore Congcretion)

Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)

Bauxite

Aluminium ore (Hydrated aluminium oxides AlOx(OH)3-2x)

Tumbled Hematite

Hematite (Fe2O3)

Copper Ore Specimen with Malachite

Cuprite, Malachite, and Limonite matrix

Hematite

Iron(III) oxide (Fe2O3)

Bauxite

Bauxite (mixture of Hydrous Aluminum Oxides)

Limonite Concretion

Limonite (FeO(OH)·nH2O)

Limonite (Iron Stone/Gossen)

Limonite (FeO(OH)·nH2O)

Limonite Concretion

Goethite/Limonite concretion (FeO(OH)·nH2O)

Limonite/Goethite on Shale

Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock

Limonite / Ironstone Concretion

Hydrated Iron Oxide (FeO(OH)%C2%B7nH2O)

Ferruginous Quartz

Quartz (Silicon Dioxide) with Iron Inclusion, SiO2

Likely weathered iron-rich rock or slag fragment

Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)

Specular Hematite

Iron Oxide (Fe2O3)

Iron Ore (Hematite/Goethite)

Ironstone (Fe2O3 / FeO(OH))

Limonite

Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Turquoise and Hematite

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

Chalcopyrite in Quartz (Gossan/Iron Hat)

CuFeS2 (Chalcopyrite) with SiO2 (Quartz)

Limonite (Ironstone Concretion)

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

Limonite (Ironstone)

Hydrated Iron Oxide (FeO(OH)·nH2O)

Iron Ore / Ironstone Concretion

Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.

Ironstone Concretion (Coprolite-like)

Goethite/Hematite Siderite Spheroid (FeCO3 or FeO(OH))

Yellow Ochre / Limonite

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

Hematite Nodule

Hematite (Fe2O3)

Limonite Geode (Ironstone Concretion)

Goethite/Limonite FeO(OH)·nH2O

Pyrite or Chalcopyrite

Iron sulfide (FeS2) or Copper iron sulfide (CuFeS2)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Hematite (Fe2O3)

Goethite/Limonite Iron Ore Node

Goethite (FeO(OH)) or Limonite (mixture of hydrated iron oxides)

Hematite

Iron(III) oxide (Fe2O3)

Limonite (Iron Ore)

Hydrated ferric oxide (FeO(OH)·nH2O)