sedimentary
Moqui Marble (Shaman Stone)
Ironstone Concretion (Goethite/Hematite-cemented Sandstone)
AI-generated identification · may be incorrectHardness 5-6 (outer rind); dark brown to iron-black; dull to earthy luster; spherical to disc shape with sandstone core.
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Physical properties
Hardness 5-6 (outer rind); dark brown to iron-black; dull to earthy luster; spherical to disc shape with sandstone core.
Formation & geological history
Formed in the Navajo Sandstone during the Jurassic period by groundwater precipitating iron minerals around a core.
Uses & applications
Prized as geological curiosities, educational display specimens, and in metaphysical practices.
Geological facts
Similar spherical iron concretions nicknamed 'blueberries' were discovered on Mars by the Opportunity rover.
Field identification & locations
Recognized by its rounded shape, dense iron exterior, and sandstone interior; found predominantly in southern Utah.
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