mineral
Moqui Marble
Hematite-Goethite Concretion (Fe2O3 / FeO(OH))
Hardness of 5.5 to 6.5 on the Mohs scale, brownish to dark reddish-black color, metallic to earthy luster, amorphous or microcrystalline internal crystal structure, specific gravity around 4.5 to 5.2.
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Physical properties
Hardness of 5.5 to 6.5 on the Mohs scale, brownish to dark reddish-black color, metallic to earthy luster, amorphous or microcrystalline internal crystal structure, specific gravity around 4.5 to 5.2.
Formation & geological history
Formed through ground water movement precipitating iron around a sand nucleus in sandstone formations, typically weathering out of the Navajo Sandstone in Utah.
Uses & applications
Popular among mineral collectors, used for meditation and metaphysical purposes, and studied for geological concretion processes.
Geological facts
Also known as shaman stones or iron marbles, they are concretions that form spherical or disc-like shapes, heavily sought after in southwestern USA.
Field identification & locations
Found predominantly in southern Utah; identified by their spherical, button-like or marble-like brown/black exterior and concentric iron shell with a sandy interior.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
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Soil with Mineral Detritus and Quartz Fragments
Regolith / Silicate Mineral Aggregate
sedimentary
Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
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Septarian Pebble
Septarian nodule / Concretion
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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Schist
Schist
Metamorphic