sedimentary
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (Hematite/Goethite shell with Sandstone core)
Hardness: 5-5.5 (shell) to 6.5-7 (core); Color: Rusty brown/reddish outside, tan/grey inside; Luster: Dull, earthy, or sub-metallic; Crystal Structure: Amorphous/Microcrystalline; Cleavage: None
- Hardness
- 5-5
- Color
- Rusty brown/reddish outside, tan/grey inside
- Luster
- Dull, earthy, or sub-metallic
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Physical properties
Hardness: 5-5.5 (shell) to 6.5-7 (core); Color: Rusty brown/reddish outside, tan/grey inside; Luster: Dull, earthy, or sub-metallic; Crystal Structure: Amorphous/Microcrystalline; Cleavage: None
Formation & geological history
Formed through the precipitation of iron oxide minerals around a nucleus (often a sand grain) within porous sandstone. They typically date from the Jurassic Period (roughly 140-190 million years ago) and 'weather out' of the Navajo Sandstone.
Uses & applications
Primary use is for metaphysical collecting and lapidary work. They are popular 'stress stones' in the New Age community and are occasionally used for jewelry or geological study.
Geological facts
Also known as Moqui Balls, they are named after the Hopi Tribe (formerly called Moqui). According to legend, ancestors would return at night to play games with these 'marbles.' Since 2005, it is illegal to collect them within the boundaries of Grand Staircase-Escalante National Monument in Utah.
Field identification & locations
Identify by their distinct spherical or discoid shape and heavy iron shell. They are most commonly found in the American Southwest (Utah and Arizona). Collectors should look for balanced weight and lack of artificial polishing.
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