sedimentary
Moqui Marble (Iron Concretion)
Goethite/Hematite Cement Sandstone Concretion
Hardness: 5.0 to 5.5, Color: Dark brown to black outer shell with tan sand interior, Luster: Dull or earthy, Structure: Spheroidal or disk-like, Cleavage: None
- Hardness
- 5
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Physical properties
Hardness: 5.0 to 5.5, Color: Dark brown to black outer shell with tan sand interior, Luster: Dull or earthy, Structure: Spheroidal or disk-like, Cleavage: None
Formation & geological history
Formed in the Jurassic Navajo Sandstone approximately 180-190 million years ago via mineral-rich groundwater precipitation around a nucleus.
Uses & applications
Geological collecting, metaphysical uses, and scientific study of groundwater chemistry.
Geological facts
Also known as Shaman Stones; similar iron-oxide concretions discovered on Mars by the Opportunity rover are nicknamed 'Blueberries'.
Field identification & locations
Found primarily in the Southwestern United States (Utah). Identified by their characteristic round shape, heavy weight for their size, and distinct iron-oxide shell.
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