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Chemical Composition: -
Group: -
System: Monoclinic
Family: Oxides
Hardness: very soft (indeterminate hardness)
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- Occasionally in black, cubic, cubo-octahedral or more
rarely dodecahedral crystals
- Microcrystalline structure
- Heavy, fragile
- Infusible, dissolves slightly in acids
- No distinct cleavage
- Uneven fracture
- Opaque with submetallic luster
- Shiny black streak
- Highly radioactive
- Specific gravity 7.5 - 9.7
- Common in desert regions, USA and USSR
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