sedimentary
Moqui Marble (Concretion)
Iron Oxide Concretion
Hardness: 5-6 (outer shell); Color: Brown, tan, rusty red; Luster: Dull/Earthy; Structure: Spherical to subspherical mass; Cleavage: None
- Hardness
- 5-6 (outer shell)
- Color
- Brown, tan, rusty red
- Luster
- Dull/Earthy
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Physical properties
Hardness: 5-6 (outer shell); Color: Brown, tan, rusty red; Luster: Dull/Earthy; Structure: Spherical to subspherical mass; Cleavage: None
Formation & geological history
Formed as minerals precipitate from flowing groundwater within porous sedimentary rocks, specifically sandstones like the Navajo Sandstone (Jurassic age).
Uses & applications
Geological research, spiritual or metaphysical collecting, and planetary science analogs (similar to 'blueberries' on Mars).
Geological facts
Also known as Moqui Balls or Shaman Stones, these are often compared to the hematite spherules found by the Opportunity rover on Mars.
Field identification & locations
Commonly found in the American Southwest, specifically Utah and Arizona. They are identified by their distinct spherical shape and dark, hard iron-rich coating.
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