sedimentary
Moqui Marble (Shaman Stone)
Ironstone Concretion (Fe2O3 with a sandstone core)
Hardness: 5-5.5 (outer shell); Color: Dark brown to reddish-brown; Luster: Dull to earthy; Structure: Spheroidal; Specific Gravity: Approx 3.0-3.4
- Hardness
- 5-5
- Color
- Dark brown to reddish-brown
- Luster
- Dull to earthy
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Physical properties
Hardness: 5-5.5 (outer shell); Color: Dark brown to reddish-brown; Luster: Dull to earthy; Structure: Spheroidal; Specific Gravity: Approx 3.0-3.4
Formation & geological history
Formed by the precipitation of iron oxide minerals around a sandstone core via groundwater movement through Jurassic-aged Navajo Sandstone (approx. 180 million years ago).
Uses & applications
Used primarily as metaphysical 'healing stones', educational geological specimens, and decorative items. Occasionally carved for small jewelry pieces.
Geological facts
Also known as Navajo Cherries or Hopi Marbles, they are protected in many National Parks and are named after the Moqui tribe. Similar hematite concretions were discovered on Mars, known as 'Martian Blueberries'.
Field identification & locations
Identify by their perfectly round to elliptical shape and distinctive dark iron shell over a lighter sand interior. Commonly found in Utah's Grand Staircase-Escalante and surrounding desert regions.
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