Mineral (Iron Ore)

Hematite (Iron Ore)

Hematite (Fe2O3)

Chrysocolla-bearing copper ore

Chrysocolla (hydrated copper aluminum silicate), commonly mixed with malachite, quartz, and iron oxides

Weathered iron-rich rock, possibly limonite-bearing quartzite or altered basalt

Indeterminate; likely quartz (SiO₂) with iron oxides/hydroxides such as limonite/goethite

Ferruginous Sandstone

Sandstone (enriched with Iron Oxide)

Gossan (Iron Hat) with Quartz and Chlorite

Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite

Quartz with Iron Staining

Silicon Dioxide (SiO2)

Ironstone concretion

Iron-oxide-cemented sedimentary concretion, commonly hematite/goethite with quartz or clay

Ironstone Concretion

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Ferruginous Sandstone (Gozzanous)

SiO2 (Quartz) with FeO(OH) (Goethite) or Fe2O3 (Hematite) coating

Magnetite Sand (Black Sand)

Magnetite (Fe3O4)

Ferruginous Sandstone

Iron-rich Clastic Sedimentary Rock

Ferruginous Quartz (Iron-Stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Likely weathered iron-rich stone

Uncertain; possibly limonite/goethite-bearing rock

Fossiliferous iron-rich breccia/conglomerate

Clastic sedimentary rock containing lithic fragments and possible fossil or concretionary structures; iron oxides/hydroxides (hematite–goethite)

Iron-rich sandstone (Gozan/Ironstone)

Ferruginous Sandstone (clastic sedimentary rock)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite (Fool's Gold) in Matrix

Iron Sulfide (FeS2)

Stainless Steel Spoon

Iron-Chromium Alloy (Fe + Cr + Ni)

Ferruginous Sandstone (Gritstone)

Clastic sedimentary rock with iron-rich cement (FeO(OH)·nH2O)

Weathered metallic-looking rock, possibly hematite-bearing ironstone

Hematite-rich ironstone; hematite Fe₂O₃, potentially with magnetite Fe₃O₄ and quartz

Specular Hematite

Specularite (Fe2O3)

Banded Iron Formation

Banded Iron Formation (BIF)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Likely weathered iron-rich rock fragments

Probably limonite/goethite-bearing material (hydrated iron oxides; FeO(OH)·nH₂O), possibly with quartz or matrix rock

Weathered iron-rich rock, possibly limonite-bearing sandstone or altered volcanic rock

Limonite/goethite mixture; exact host rock is indeterminate from the image

Likely tumbled black stone or glassy mineral

Indeterminate from image; possibilities include obsidian, hematite, or black tourmaline

Magnetite

Magnetite (Fe3O4)

Ironstone (iron-oxide-rich rock)

Ironstone, composed mainly of hematite (Fe₂O₃) and/or goethite (FeO(OH)); exact minerals cannot be confirmed visually

Tumbled magnetite (likely)

Magnetite, Fe₃O₄

Goethite-rich ironstone

Goethite, α-FeO(OH), likely with limonite and other iron oxides

Banded iron formation (ironstone), likely specular hematite–magnetite variety

Banded iron formation (BIF), chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and quartz (SiO₂)

Sandstone with Iron Oxide (Limonite/Hematite)

Ferruginous Sandstone (SiO2 with FeO(OH)·nH2O)

Rounded iron-rich river pebble

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

Iron-oxide-stained rock with a pale mineral vein

Likely limonite/goethite-stained quartz-bearing rock; exact identification is uncertain from the image

Magnetite (potentially Hematite-rich)

Magnetite (Fe3O4)

Hematite

Iron(III) oxide (Fe2O3)

Pyrite

Iron Sulfide (FeS2)

Drill Core (Basalt or Andesite)

Volcanic porphyry (mafic to intermediate)