Mineral, Specifically An Iron Ore

Basalt River Stone

Basalt (Mafic volcanic rock, primarily Plagioclase and Pyroxene)

Small red-brown mineral or rock fragment

Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (goethite)

Hematite Pebble

Iron(III) oxide (Fe2O3)

Moqui Marble (Moqui Ball)

Ironstone Concretion (Goethite/Hematite cemented Sandstone)

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Lake Superior Agate

Chalcedony (SiO2 with iron impurities)

Native Copper with Malachite/Oxide Coating

Native Copper (Cu)

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

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

Magnetite / Iron Ore

Magnetite (Fe3O4)

Limonite Concretion

Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O

Ironstone Concretion

Siderite / Hematite-bearing Sedimentary Rock

Orange Calcite

Calcium Carbonate (CaCO3)

Hematite / Goethite (Iron Ore)

Iron Oxide (Fe2O3 / FeO(OH))

Iron-rich concretion or slag-like mineral fragment

Likely limonite/goethite (FeO(OH)·nH₂O), possibly magnetite-bearing material

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Titanium-Coated Hematite (Aura Hematite)

Titanium-bonded Hematite (Fe2O3 with a Ti coating)

Pyrite

Iron Sulfide (FeS2)

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

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

Ferruginous Sandstone (Gozzan/Ironstone)

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

Honey Calcite

Calcium Carbonate (CaCO3)

Magnetite (Octahedral Crystal)

Magnetite (Fe3O4)

Limonite Concretion

Goethite/Limonite (FeO(OH)·nH2O)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Ironstone Concretion

Ironstone (Limonite/Goethite Concretion)

Ironstone with Limonite/Goethite coating

Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)

Magnetite Nodule

Magnetite (Fe3O4)

Magnetite

Magnetite (Fe3O4)

Banded Iron Formation (BIF) / Tiger Iron variety

Banded Iron Formation (predominantly Hematite, Magnetite, and Chert/Quartz - SiO2 + Fe2O3)

Pyrite in Matrix (Gold-colored Chalcopyrite or Pyrite)

Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)

Likely weathered iron-rich stone

Uncertain; possibly limonite/goethite-bearing rock

Red Sandstone

Arenite (SiO2 with Fe2O3)

Iron-rich weathered rock (likely limonite/goethite concretion)

Limonite–goethite mixture; chiefly FeO(OH)·nH₂O

Amethyst (Ametrine or Bicolor Quartz variant)

Silicon Dioxide (SiO2) with iron impurities

Botryoidal Hematite

Iron Oxide (Fe2O3)

Hematite Concretion

Iron(III) oxide (Fe2O3)

Amethyst on Matrix

Amethyst (Silicon Dioxide, SiO2) with impurities of iron and irradiation

Carnelian

Carnelian (SiO2)

Magnetite (Iron Ore)

Iron(II,III) oxide (Fe3O4)

Limonite (with Goethite/Ironstone)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Apricot Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Brecciated Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities