sedimentary

Moqui Marble (Shaman Stone)

Ironstone Concretion (Goethite/Hematite Shell)

AI-generated identification · may be incorrect

Hardness: 5-5.5 (outer shell); Color: Dark brown to black; Luster: Dull, earthy; Structure: Spherical or subspherical concretion; Cleavage: None; Composition: Sandstone core with an iron-oxide rind.

Hardness: 5-5
Color: Dark brown to black
Luster: Dull, earthy

Identified July 19, 2026More sedimentary →

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Physical properties

Hardness: 5-5.5 (outer shell); Color: Dark brown to black; Luster: Dull, earthy; Structure: Spherical or subspherical concretion; Cleavage: None; Composition: Sandstone core with an iron-oxide rind.

Formation & geological history

Formed in the Jurassic-aged Navajo Sandstone (approx. 180-190 million years old) when iron-rich groundwater precipitated minerals around a nucleus, often a sand grain or organic matter.

Uses & applications

Primarily used as metaphysical 'healing stones', massage tools, collectibles, and geological curiosities.

Geological facts

Legend says Hopi ancestors' spirits returned at night to play games with these 'marbles'. They are also known as 'Shaman Stones' or 'Mochi Marbles'. Collecting them within US National Park boundaries is strictly prohibited.

Field identification & locations

Identified by their dark, pitted, weathered iron-oxide shells and round shape. They are found scattered on the ground in the American Southwest, mainly Utah and Arizona, where the surrounding sandstone has eroded away.