Hematite
Iron(III) oxide (Fe2O3)
mineral
Category
Metal (Elemental Mineral)
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Pyrite in Matrix (likely Quartz or Coal)
Iron Sulfide (FeS2)
mineral
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Specular Hematite Geode/Nodule
Specularite (Polycrystalline Hematite), Fe2O3
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Magnetite (likely in Hematite or Ironstone)
Magnetite (Fe3O4)
mineral
Muscovite Mica (with Quartz)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Limonite (Iron Stone/Goethite)
Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Galena
Lead(II) sulfide (PbS)
mineral
Specular Hematite (Specularite)
Hematite (Iron(III) oxide) - Fe2O3
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Moissanite
Silicon Carbide (SiC)
mineral
Gold Nugget
Native Gold (Au)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Limonite (Iron Ore)
Goethite and related iron hydroxides (FeO(OH)·nH2O)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Moqui Marble
Hematite-Goethite Concretion
mineral
Mica Schist
Mica Schist (primarily Muscovite and Biotite)
metamorphic
Ironstone Concretion
Ironstone (primarily Siderite or Limonite)
sedimentary
Limonite pseudo-concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
sedimentary
Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
sedimentary
Anthracite Coal with Sulfur staining
Anthracite (Carbon C with impurities)
metamorphic
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Basalt
Mafic extrusive igneous rock
igneous
Green fluorite (likely polished/cut specimen)
Fluorite, calcium fluoride (CaF₂)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Vivianite
Vivianite, Fe2+3(PO4)2·8H2O
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
Fluorite on Host Rock
Calcium Fluoride (CaF2)
mineral