sedimentary

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (Hematite/Goethite)

AI-generated identification · may be incorrect

Hardness: 5-6 (outer shell); Color: Brown, tan, rusty red; Luster: Dull to earthy; Structure: Spherical or disc-shaped concretion; Cleavage: None.

Hardness: 5-6 (outer shell)
Color: Brown, tan, rusty red
Luster: Dull to earthy

Identified July 17, 2026More sedimentary →

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Physical properties

Hardness: 5-6 (outer shell); Color: Brown, tan, rusty red; Luster: Dull to earthy; Structure: Spherical or disc-shaped concretion; Cleavage: None.

Formation & geological history

Formed in the Jurassic-aged Navajo Sandstone in Utah. These are concretions produced by the precipitation of iron-rich minerals from groundwater flowing through permeable sandstone layers approximately 190 million years ago.

Uses & applications

Primarily used as metaphysical 'shaman stones' in spiritual practices, as collectible geological specimens, and occasionally in mineral teaching sets.

Geological facts

Also known as Moqui balls, they are often found in pairs (smooth 'female' and ridged 'male' stones). Similar iron-oxide structures were found on Mars by the Opportunity rover and are nicknamed 'Martian Blueberries'.

Field identification & locations

Identify by their distinct spherical shape, sandpaper-like texture, and rusty color. They are protected by law in US National Parks, so they should only be collected from private land or outside park boundaries.