Mineral (Iron Ore)

Weathered iron-rich rock (possibly ironstone)

Likely ferruginous sandstone or ironstone; exact identification requires examination

Weathered iron-rich stone, possibly limonite-bearing rock

Limonite/goethite mixture (hydrated iron oxides), identification uncertain from image

Yellow Ochre / Limonite

Hydrated ferric oxide (FeO(OH)·nH2O)

Hematite

Hematite (Iron(III) oxide, Fe2O3)

Limonite with Hematite

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Likely hematite-rich ironstone or metallic mineral fragment

Hematite (Fe₂O₃), possibly with magnetite (Fe₃O₄) or metallic iron

Iron-rich rock, possibly limonite/goethite

Likely goethite (α-FeO(OH)) and/or limonite; exact identification requires testing

Limonite Concretion

FeO(OH)qnH2O (Hydrated iron(III) oxide-hydroxide mixture)

Magnetite

Magnetite (Fe3O4)

Limonite (Yellow Ochre)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Limonite-stained Gossan/Ironstone

Goethite and Hematite (Fe2O3 • nH2O)

Hematite

Iron(III) oxide (Fe2O3)

Likely weathered iron-rich rock or slag fragment

Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)

Likely hematite-rich iron ore

Hematite, Fe₂O₃, possibly mixed with magnetite or other iron oxides

Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Limonite (Yellow Ochre)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Hematite

Iron(III) oxide (Fe2O3)

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

Limonite/goethite-rich ferruginous sandstone; composition uncertain from the photograph

Hematite

Hematite (Fe2O3)

Limonite Geode (Ironstone Concretion)

Limonite [FeO(OH)·nH2O] with possible Quartz or Calcite interior

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Chalcopyrite (Peacock Ore)

Copper Iron Sulfide (CuFeS2)

Polished hematite bead necklace

Hematite (iron(III) oxide, Fe₂O₃), likely polished beads

Red Hematite

Iron(III) oxide (Fe2O3)

Limonite (Iron Ore)

Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)

Dark rounded pebble, likely hematite-rich ironstone

Possibly hematite (Fe₂O₃) or iron-rich goethite/limonite; the photo alone cannot confirm composition

Tumbled Hematite

Hematite (Fe2O3)

Tumbled hematite-rich ironstone

Hematite (Fe₂O₃), possibly magnetite (Fe₃O₄) or iron-rich slag-like material

Limonite

Limonite (Hydrated iron oxide mixture, FeO(OH)·nH2O)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Blue metallic mineral specimen, possibly bornite or chalcopyrite

Bornite (Cu₅FeS₄) or chalcopyrite (CuFeS₂); exact identification requires testing

Likely iron-rich rock or weathered metallic mineral fragment

Uncertain; possibly limonite/goethite or iron-bearing slag

Limonite (Ochreous)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Blue Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Chrysocolla-bearing copper ore

Chrysocolla (hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), likely with malachite, quartz, and iron oxides

Likely hematite-rich iron ore

Hematite (Fe₂O₃), possibly with magnetite and/or goethite

Goethite

Goethite (FeO(OH))

Limonite (Iron Ore)

FeO(OH)·nH2O

Hematite

Iron(III) oxide (Fe2O3)

Chalcopyrite in Quartz (Gossan/Iron Hat)

CuFeS2 (Chalcopyrite) with SiO2 (Quartz)

Tumbled hematite (likely hematite-rich iron oxide)

Hematite, Fe₂O₃; possibly mixed with magnetite, Fe₃O₄