sedimentary
Moqui Marble
Hematite concretion (Iron oxide), Fe2O3
Hardness: 5-6 (outer shell), Color: Dark brown to black, Luster: Metallic to earthy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 5.2 - 5.3
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Physical properties
Hardness: 5-6 (outer shell), Color: Dark brown to black, Luster: Metallic to earthy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 5.2 - 5.3
Formation & geological history
Formed as iron-rich sandstone concretions in the Jurassic-age Navajo Sandstone through groundwater precipitation of iron oxide minerals. Found primarily in Southern Utah.
Uses & applications
Used primarily in metaphysical collecting, as teaching specimens for geology, and occasionally used in jewelry as beads or charms.
Geological facts
Also known as Shaman Stones. Geological studies suggest they formed about 25 million years ago. Similar blueberry-shaped spherules were found on Mars by the Opportunity rover.
Field identification & locations
Identify by their distinct spherical or ellipsoidal shape and hard, dark iron shell over a sandy core. Found in Utah desert regions where the soft sandstone has eroded away.
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