Boltwoodite
A variety of Minerals
What is Boltwoodite?
Boltwoodite is a hydrated potassium uranyl silicate mineral with formula HK(UO2)(SiO4)·1.5(H2O). It is formed from the oxidation and alteration of primary uranium ores. It takes the form of a crust on some sandstones that bear uranium. These crusts tend to be yellowish with a silky or vitreous luster.
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Key Characteristics
Formation of Boltwoodite
It was first described in 1956 for an occurrence in Pick's Delta Mine, Delta, San Rafael District (San Rafael Swell), Emery County, Utah, US. It is named after Bertram Boltwood (1870–1927) an American pioneer of radiochemistry. Boltwoodite occurs as secondary silicate alteration crusts surrounding uraninite and as fracture fillings. It is found in pegmatites and sandstone uranium deposits of the Colorado Plateau-type. It occurs associated with uraninite, becquerelite, fourmarierite, phosphouranylite, gypsum and fluorite.
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Quick Facts
Physical Properties
- Color
- Pale yellow, orange yellow
- Hardness (Mohs)
- 3.5 - 4
- Density
- 4.46 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- (K,Na)(UO2)(SiO3OH) · 1.5H2O
- Elements
- H, K, Na, O, Si, U
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