Mineral, Specifically An Iron Ore

Honey Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Iron-rich mineral fragment, possibly limonite/goethite

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

Limonite-stained Gossan/Ironstone

Goethite and Hematite (Fe2O3 • nH2O)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Hematite

Iron(III) oxide (Fe2O3)

Limonite (Ironstone Concretion)

Limonite: FeO(OH)·nH2O

Basalt (with possible alteration or lichen)

Mafic volcanic rock (primarily Plagioclase and Pyroxene)

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

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese

Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Tiffany Stone

Bertrandite Fluorite (CaF2 + Be4Si2O7(OH)2)

Limonite (Yellow Ochre)

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

Likely tumbled hematite or hematite-rich ironstone

Hematite (Fe₂O₃), possibly magnetite-bearing ironstone

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Hematite (Fe2O3)

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

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

Yellow Quartz (Polished)

Silicon Dioxide (SiO2) with iron inclusions

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)

Red Hematite

Iron(III) oxide (Fe2O3)

Chalcopyrite (Peacock Ore)

Copper Iron Sulfide (CuFeS2)

Limonite (Ironstone)

Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))

Wild Horse Magnesite

Magnesite with Hematite inclusions (MgCO3)

Tumbled Hematite

Hematite (Fe2O3)

Tumbled hematite-rich ironstone

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

Iron-rich weathered pebble

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

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Limonite

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

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)

Chrysocolla-bearing copper ore

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

Sandstone (Banded)

Arenite (primarily SiO2)

Quartz (specifically Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Goethite

Goethite (FeO(OH))

Weathered iron-rich rock, possibly limonite-bearing sandstone

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

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