sedimentary
Moqui Marble
Iron-oxide concretion (typically Goethite or Hematite)
Hardness: 5-6 (shell), Color: Dark brown to black exterior with sandy interior, Luster: Dull/Earthy, Structure: Spherical or ellipsoidal concretion, Cleavage: None
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Physical properties
Hardness: 5-6 (shell), Color: Dark brown to black exterior with sandy interior, Luster: Dull/Earthy, Structure: Spherical or ellipsoidal concretion, Cleavage: None
Formation & geological history
Formed within the Navajo Sandstone in the Jurassic period (approx. 180-190 million years ago) through the precipitation of iron minerals from groundwater moving through pore spaces.
Uses & applications
Primarily used as metaphysical stones, educational specimens, and in research regarding Martian hematite blueberries.
Geological facts
These concretions are often compared to the 'blueberries' found on Mars by the Opportunity rover, which indicate a history of water on the red planet.
Field identification & locations
Found in the Southwestern United States, particularly Utah. Identified by their spherical shape and heavy iron outer shell. Collecting is restricted in many areas, such as National Parks.
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