sedimentary

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (composed primarily of Quartz sand with Hematite/Goethite shell)

AI-generated identification · may be incorrect

Hardness: 5-6 (shell), 7 (core); Color: Rusty brown to dark chocolate outer shell, tan interior; Luster: Dull, earthy; Crystal structure: Amorphous/microcrystalline shell, granular core; Specific gravity: 3.3-4.3 (shell)

Hardness: 5-6 (shell), 7 (core)
Color: Rusty brown to dark chocolate outer shell, tan interior
Luster: Dull, earthy

Identified March 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed in the Jurassic Navajo Sandstone (approx. 180-190 million years old) through a precipitation of iron minerals from groundwater moving through porous sandstone, often collecting around a small organic nucleus.

Uses & applications

Primarily used as metaphysical 'healing' stones, educational geological specimens, and decorative items. Not used in heavy industry or construction due to size and varying structural integrity.

Geological facts

They are named after the Hopi people (formerly known as the Moqui). Similar spherical concretions have been discovered on Mars by the Opportunity rover, where they are colloquially referred to as 'blueberries'.

Field identification & locations

Identify by their spherical or puck-like shape and distinct iron skin. Commonly found in the American Southwest (Utah/Arizona). Note: Collecting within National Parks is illegal; specimens found on private land are the main source for collectors.