Limonite (Ironstone Concretion)
Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)
sedimentary
Category
Mineral, Specifically An Iron Ore
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Botryoidal Hematite (Kidney Ore)
Iron(III) oxide (Fe2O3)
mineral
Ironstone Concretion / Limonite Specimen
Goethite and Limonite (Hydrous Iron Oxides)
sedimentary
Pyrite and Sunstone
Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)
mineral
Yellow Quartz (Citrine or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Limonite/Ironstone
Limonite (FeO(OH)·nH2O)
mineral
Magnetite-rich iron ore (probable magnetite schist)
Magnetite (Fe₃O₄) in a foliated metamorphic matrix, possibly magnetite–biotite schist
metamorphic
Specular Hematite
Hematite (Fe2O3)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Copper Ore Specimen
Cupriferous Rock / Malachite-bearing ore
mineral
Magnetite with Pyroxene
Magnetite (Fe3O4) in Mafic Igneous Matrix
mineral/igneous
Pyrite
Iron Disulfide (FeS2)
mineral
Limonite / Goethite Ironstone
FeO(OH)·nH2O (Hydrous iron oxide)
mineral
Yellow Aventurine
Quartz (SiO2) with iron-bearing inclusions
mineral
Ironstone Concretion (Limonite/Goethite)
Ferruginous Siltstone / Limonite Concretion (FeOO(OH)·nH2O)
sedimentary
Weathered iron-rich sandstone or laterite fragment
Ferruginous sandstone, likely hematite/goethite-cemented sandstone (exact identification requires testing)
sedimentary
Citrine Quartz
Silicon Dioxide (SiO₂) with iron impurities
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Iron Slag
Anthropogenic Ferro-silicate
mineral
Specular Hematite with Quartz
Ferric oxide (Fe2O3) and Silicon dioxide (SiO2)
Mineral
Goethite (Iron Ore)
Goethite (FeO(OH))
mineral
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3/FeO(OH))
mineral
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Sandstone
Arenite (specifically Iron-stained Quartz Sandstone)
sedimentary
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Red Jasper
Silicon dioxide (SiO2) with hematite (Fe2O3) inclusions
mineral
Specular Hematite (on Schist/Matrix)
Hematite (Alpha-Fe2O3)
mineral
Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxides (FeO(OH)·nH2O)
mineral
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite
sedimentary
Ironstone Concretion (Boxwork)
Siderite-Limonite Concretion (FeO(OH)·nH2O)
sedimentary
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Iron-rich weathered stone, possibly hematite-rich ironstone
Hematite/goethite-bearing ironstone; predominantly Fe₂O₃ and FeO(OH)
mineral
Orange Calcite (Iron-Stained)
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Sandstone (Banded)
Arenite (primarily SiO2)
sedimentary
Specular Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Yellow Quartz (Polished)
Silicon Dioxide (SiO2) with iron inclusions
mineral