Mineral (Iron Ore)

Hematite

Hematite (Iron(III) oxide, Fe2O3)

Specular hematite (iron ore), possibly with goethite

Hematite, Fe₂O₃; the metallic gray material may include goethite, FeO(OH), and other iron oxides

Ironstone Concretion

Siderite / Hematite-bearing Sedimentary Rock

Carnelian

Carnelian (SiO2)

Magnetite / Hematite (Iron Ore Pebble)

Fe3O4 (Magnetite) / Fe2O3 (Hematite)

Hematite

Iron (III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Likely iron-rich hematite or goethite

Hematite (Fe₂O₃) or goethite (FeO(OH)); the photo alone cannot distinguish them confidently.

Magnetite / Hematite (Iron Ore)

Magnetite (Fe3O4) or Hematite (Fe2O3)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Pyrite with Galena and Sphalerite on Matrix

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

Polished hematite-rich ironstone

Hematite (Fe₂O₃), likely mixed with magnetite and iron-rich jasper

Ironstone Concretion

Ironstone (Limonite/Goethite Concretion)

Ferruginous Sandstone (Gozzan/Ironstone)

Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)

Weathered iron-rich rock, possibly limonite-bearing sandstone

Limonite/goethite mixture, approximately hydrated iron oxides (FeO(OH)·nH₂O), possibly coating sandstone or ironstone

Iron-rich breccia or weathered ironstone

Hematite/goethite-bearing breccia; exact identification requires testing

Laterite (iron-rich nodule, possibly Bauxite as a subtype)

Laterite (composed of various minerals including goethite, hematite, gibbsite, etc.)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Weathered iron-rich rock, possibly limonite-bearing sandstone or laterite

Limonite/goethite-rich ferruginous rock; exact identification requires testing

Weathered iron-rich concretion or ironstone nodule

Goethite–hematite limonite concretion (FeO(OH), Fe₂O₃, and hydrous iron oxides)

Pyrite in Matrix

Iron Disulfide (FeS2)

Ironstone concretion (possible pyrite-bearing nodule)

Iron-oxide-rich concretion, chiefly goethite/hematite; composition cannot be confirmed from the image

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Uncertain dark metallic mineral specimen, possibly specular hematite or magnetite

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

Magnetite (Loadstone candidate)

Iron(II,III) oxide (Fe3O4)

Magnetite (Small Granule)

Magnetite (Fe3O4)

Hematite

Hematite (Fe2O3)

Banded iron formation (specimen, possibly hematite–jasper)

Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and silica (chert/quartz), with possible limonite/goethite staining

Yellow iron-oxide-rich mineral/rock fragment

Likely limonite/goethite (hydrated iron oxides; commonly approximated as FeO(OH)·nH₂O)

Hematite (Iron Ore)

Hematite (alpha-Fe2O3)

Pyrite and Chalcopyrite in Fluorite Matrix

Calcium Fluoride (CaF2) with Iron Sulfide (FeS2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Possible ironstone concretion

Iron-oxide-rich concretion, likely hematite/goethite; exact identification is uncertain from the photo

Banded Iron Formation

Banded Iron Formation (BIF)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Botryoidal hematite (ironstone)

Hematite, Fe₂O₃

Botryoidal Hematite

Iron Oxide (Fe2O3)

Iron-rich concretion or weathered ironstone

Goethite–hematite-rich limonite (FeO(OH)·nH₂O / Fe₂O₃)

Limonite (Iron Stone/Ocher)

Limonite (FeO(OH)·nH2O)

Botryoidal Hematite (Iron Stone Conglomerate)

Hematite (Fe2O3) in sedimentary matrix

Metallic sulfide ore fragment, possibly pyrite-bearing rock

Indeterminate; likely pyrite (FeS₂) in a sulfide-rich matrix

Iron-rich mineral fragment, possibly limonite/goethite

Limonite (hydrated iron oxides; commonly goethite, FeO(OH), with hematite)