sedimentary
Boji Stone (Pop Rocks or Moqui Marbles)
Iron-manganese oxide concretion (Goethite/Hematite/Jarosite)
Hardness: 5.0-5.5 (Mohs scale); Color: Brown to blackish-brown; Luster: Dull, earthy to metallic; Structure: Spherical or disc-shaped concretions; Cleavage: None; Specific Gravity: 3.4-4.2
- Hardness
- 5
- Color
- Brown to blackish-brown
- Luster
- Dull, earthy to metallic
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Physical properties
Hardness: 5.0-5.5 (Mohs scale); Color: Brown to blackish-brown; Luster: Dull, earthy to metallic; Structure: Spherical or disc-shaped concretions; Cleavage: None; Specific Gravity: 3.4-4.2
Formation & geological history
Formed by the precipitation of iron and manganese minerals from groundwater through sedimentary layers, often around a nucleus like a leaf or shell, typically within sandstone formations like the Navajo Sandstone.
Uses & applications
Predominantly used as metaphysical healing stones, meditation aids, and geological collector specimens.
Geological facts
They are often sold in pairs designated as 'male' (rough with protrusions) and 'female' (smooth). Similar concretions on Mars, nicknamed 'blueberries', were discovered by the Opportunity rover.
Field identification & locations
Identified by their distinctive round or bun-like shape and iron-rich crust. Mainly found in the American Southwest, particularly Utah and Kansas.
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