Mineral, Specifically An Iron Ore

Weathered iron-rich rock or concretion

Likely limonite/goethite-bearing concretion; exact identification requires testing

Pink Himalayan Salt (Halite)

Halite - NaCl (Sodium Chloride) with trace Iron Oxide and Magnesium

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Hematite

Iron(III) oxide (Fe2O3)

Raw Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Uncertain dark metallic mineral specimen, possibly specular hematite or magnetite

Likely hematite (Fe₂O₃) or magnetite (Fe₃O₄); image alone is insufficient for firm identification

Weathered iron-rich rock, possibly meteorite

Uncertain; likely goethite/hematite-rich material, with meteorite possibility

Basalt with Quartz Veins

Mafic Igneous Rock with Quartz (SiO2) intrusions

Copper Ore (with Malachite/Chrysocolla and Iron Oxides)

Secondary Copper Minerals (Cu2(CO3)(OH)2 / (Cu,Al)2H2Si2O5(OH)4·nH2O)

Iron-rich weathered rock, possibly limonite/goethite-bearing ore

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

Magnetite

Magnetite (Fe3O4)

Turquoise and Hematite

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

Likely weathered iron-rich rock or laterite

Uncertain; possible limonite/goethite-rich laterite (FeO(OH)·nH₂O)

Basalt

Basalt (composition predominately plagioclase feldspar and pyroxene)

Hematite

Iron(III) oxide (Fe2O3)

Pyrite with Galena and Sphalerite on Matrix

Iron Sulfide (FeS2), Lead Sulfide (PbS), Zinc Sulfide (ZnS)

Limonite on Sandstone

Iron Oxyhydroxide (FeO(OH)·nH2O) on Quartz Sandstone

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Gossan (with Limonite and Hematite)

Gossanous iron-oxide rock (Fe2O3 · nH2O)

Moss Agate

Chalcedony (Silicon Dioxide / SiO2)

Sandstone Beach Pebble

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)

Iron-Oxide Concretion (Moqui Marble)

Goethite/Hematite Concretion (Fe2O3 / FeO(OH))

Banded Iron Formation (BIF)

Banded Iron Formation

Hematite Nodular Iron Ore

Hematite (Fe2O3)

Chert (specifically Flint or Jasperoid)

Silicon Dioxide (SiO2)

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Iron Slag

Ferrous Slag (Silicate/Oxide mixture)

Ironstone Nodules (Iron Concretion)

Siderite or Hematite Concretion

Mahogany Obsidian

Obsidian (Volcanic Glass with Hematite/Magnetite inclusions), SiO2

Pyrite in Quartzite/Graphite Matrix

Iron Sulfide (FeS2)

Amethyst (specifically Chevron Amethyst or Dream Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Limonite (Iron Stone/Ocher)

Limonite (FeO(OH)·nH2O)

Fancy Jasper

Jasper (Cryptocrystalline Quartz, SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) - Impure Cryptocrystalline Quartz

Iron Concretion

Ferruginous concretion (Fe2O3·nH2O / FeO(OH))

Chrysocolla (with Hematite/Iron Oxides)

Chrysocolla: (Cu, Al)2H2Si2O5(OH)4 · nH2O

Red Jasper and Mookaite Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Multi-Gemstone Quartz Bracelet (Amethyst, Aventurine, Rose Quartz, Clear Quartz)

Silicon Dioxide (SiO2) mixture

Goethite

Goethite (FeO(OH))

Limonite / Ironstone Nodule

Hydrated Iron Oxide (FeO(OH)·nH2O)

Hematite

Iron(III) oxide (Fe2O3)

Sandstone (specifically Picture Sandstone or Wonderstone)

Arenite (composed primarily of SiO2)