sedimentary
Moqui Marble
Hematite Concretion (Iron Oxide Concretion)
Hardness: 5-5.5 (center) to 6.5 (shell); Color: Dark brown to black outer shell with sandy tan interior; Luster: Dull or earthy; Crystal structure: Amorphous to microcrystalline; Cleavage: None
- Hardness
- 5-5
- Color
- Dark brown to black outer shell with sandy tan interior
- Luster
- Dull or earthy
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Physical properties
Hardness: 5-5.5 (center) to 6.5 (shell); Color: Dark brown to black outer shell with sandy tan interior; Luster: Dull or earthy; Crystal structure: Amorphous to microcrystalline; Cleavage: None
Formation & geological history
Formed during the Jurassic period (approx. 190 million years ago) via groundwater precipitation of iron oxide around a sandstone nucleus within the Navajo Sandstone formation.
Uses & applications
Commonly used as metaphysical 'shaman stones' for meditation, energy work, and as unique mineral collectibles.
Geological facts
The name 'Moqui' comes from the Hopi tribe's former name. They are often found in pairs (smooth 'female' and ridged 'male' stones) and are geologically similar to 'blueberries' found on Mars by the Opportunity rover.
Field identification & locations
Identified by their nearly perfect spherical or acorn shape and dark, heavy iron crust. Primarily found in the Grand Staircase-Escalante National Monument in southern Utah. Note: Collecting is regulated or prohibited in some parks.
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