Mineral (Iron Ore)

Botryoidal Hematite (Kidney Ore)

Hematite (Fe2O3)

Iron-rich laterite or limonite/goethite-bearing rock

Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O), likely in a lateritic matrix

Tiger's Eye (with Hematite/Magnetite matrix)

Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH/Fe2O3)

Pyrite (or Arsenopyrite / Ore mineral aggregate)

FeS2 (Iron Sulfide)

Iron-rich stone, likely limonite/goethite-bearing rock

Limonite (hydrated iron oxides; chiefly goethite, FeO(OH), with possible hematite)

Iron-rich weathered pebble

Likely limonite/goethite-bearing ferruginous rock; exact identification requires testing

Iron-oxide-stained rock, likely limonite/goethite-rich material

Likely goethite (α-FeO(OH)) and/or limonite (a mixture of hydrated iron oxides), staining a silicate-rich rock

Ironstone Concretion (Limonite/Goethite)

Ferruginous Siltstone / Limonite Concretion (FeOO(OH)·nH2O)

Limonite Concretion (Ironstone)

Limonite (FeO(OH)·nH2O) with Goethite and Hematite

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Limonite after Marcasite (Propeller Conchoid)

Goethite/Limonite pseudomorph after Marcasite (FeO(OH)·nH2O)

Limonite Pseudomorph after Pyrite

Limonite (FeO(OH)·nH2O) replacing Pyrite (FeS2)

Limonite Concretion (Goonie or Rattlestone)

Limonite (FeO(OH)·nH2O)

Botryoidal hematite (specular/earthy hematite)

Hematite, Fe₂O₃

Magnetite-rich iron ore

Magnetite (Fe₃O₄), possibly mixed with hematite or metallic sulfides

Limonite (Iron-rich Siltstone / Sandstone base)

Hydrous ferric oxide mixture (FeO(OH)·nH2O)

Magnetite (Lodestone variety)

Magnetite (Fe3O4)

Magnetite / Lodestone

Magnetite (Fe3O4)

Ferruginous Sandstone

Sandstone (rich in iron oxides/hydroxides)

Likely iron-rich rock or weathered hematite

Hematite (Fe₂O₃), possibly limonite/goethite-rich material

Limonite (Yellow Ochre)

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

Copper Ore Specimen

Cupriferous Rock / Malachite-bearing ore

Ironstone concretion (possibly pyrite-bearing)

Iron-rich sedimentary concretion, likely composed of goethite/limonite with possible pyrite

Hematite

Iron(III) oxide (Fe2O3)

Ironstone Concretion

Ferruginous Sandstone / Siderite Concretion

Ironstone Concretion (Boxwork)

Siderite-Limonite Concretion (FeO(OH)·nH2O)

Limonite (Iron Stone/Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Magnetite (in matrix)

Magnetite (Fe3O4)

Iron-rich breccia or weathered limonite-bearing rock

Goethite–limonite ironstone, possibly ferruginous breccia

Pyrite

Iron Sulfide (FeS2)

Botryoidal hematite-goethite ironstone

Hematite (Fe₂O₃) with goethite (FeO(OH)), likely iron-rich weathering product

Iron-stained quartzite or ironstone

Likely ferruginous quartzite, composed mainly of quartz (SiO₂) with iron oxides such as hematite and goethite

Ferruginous Sandstone

Ferruginous Sandstone (Quartz grains with Iron Oxide cement)

Polished hematite (likely hematite-rich ironstone)

Hematite, Fe₂O₃; possibly mixed with magnetite or jasper

Yellow Ocher (Iron-rich Silt/Clay)

Goethite-rich Limonite (FeO(OH)qnH2O)

Hematite (iron oxide)

Hematite, α-Fe₂O₃

Weathered iron-rich rock, possibly limonite/goethite

Limonite (hydrated iron oxides; commonly goethite, FeO(OH), mixed with hematite)

Limonite/goethite-bearing ironstone (probable)

Goethite, α-FeO(OH), commonly mixed with limonite (hydrated iron oxides) and host rock

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Hematite (Iron Ore)

Hematite (Fe2O3)

Limonite/goethite-rich ironstone

Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O)