Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)
sedimentary
Category
Mineral (Iron Ore)
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Pyrite-bearing Rock
Iron Sulfide (FeS2) associated with host rock
mineral
Hemimorphite on Limonite Gossan
Hemimorphite (Zn4Si2O7(OH)2·H2O) on Limonite matrix
mineral
Hematite
Ferric oxide (Fe2O3)
mineral
Earthy Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Iron-rich botryoidal limonite/goethite specimen
Limonite (amorphous hydrated iron oxides, chiefly goethite, α-FeO(OH))
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Specular Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Gold Ore (in Quartz/Gossan matrix)
Native Gold (Au) in Limonite/Quartz matrix
mineral
Limonite (Ironstone)
Limonite (mixture of hydrated iron(III) oxide-hydroxides)
mineral
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Ferruginous Siltstone or Mudstone
Ferruginous Siltstone / Goethitic Sandstone
sedimentary
Ironstone Concretion
Goethite-rich Siltstone / Siderite (FeCO3)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Banded iron formation (ironstone)
BIF; hematite–magnetite–quartz/chert assemblage
sedimentary
Likely weathered iron-rich rock (possible limonite/goethite-bearing stone)
Limonite–goethite mixture, commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Cube variety)
Iron Sulfide (FeS2)
mineral
Arsenopyrite
Arsenopyrite (FeAsS)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Limonite (Bog Iron)
Limonite (Hydrated iron(III) oxide-hydroxide) - FeO(OH)·nH2O
mineral
Hematite
Hematite (Fe2O3)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Iron Nodule
Iron-manganese concretion (Fe-Mn hydroxide)
sedimentary
Azurite Malachite
Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2CO3(OH)2)
mineral
Ironstone pebble
Ironstone (Ferruginous Sedimentary Rock)
sedimentary
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Iron-rich concretion (probable limonite/goethite concretion)
Hydrated iron oxides, chiefly limonite (FeO(OH)·nH₂O) and goethite (FeO(OH))
sedimentary
Iron Slag
Iron Slag (Industrial Vitreous Material)
Mineral/By-product
Chalcopyrite on Quartz
Copper Iron Sulfide (CuFeS2)
mineral
Ferruginous Sandstone (Ironstone)
Iron-rich Arenite
sedimentary
Ironstone Nodules (Limonite/Hematite)
Goethite/Hematite mix (FeO(OH)/Fe2O3)
sedimentary
Limonite/Goethite Concretion
Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Aquamarine
Beryllium Aluminum Silicate (Be3Al2Si6O18)
gemstone
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Ironstone concretion / Limonitic Sandstone
Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)
sedimentary
Slag
Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)
igneous (artificial/anthropogenic)
Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite-Hematite-Chert)
sedimentary
Magnetite or Hematite (Iron Stone)
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite Nodules (Moqui Marbles)
Ferric Oxide (Fe2O3)
mineral