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Mineralpedia Details for Boltwoodite

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Boltwoodite

Boltwoodite

Named in honor of Bertram Borden Boltwood, a radiochemist formerly of Yale University in Connecticut, USA who developed the U-Pb method of measuring geologic time. Boltwoodite is a rare mineral that can be found “in the outer silicate zone of alteration surrounding hydrated uranyl oxides incrusting primary uraninite. [and] also filling fractures at some distance from primary uraninite, [as well as] from pegmatite and Colorado-Plateau-type sandstone uranium deposits.” Localities include in the USA, Namibia, Scotland, Rwanda, Argentina, Australia, Japan, and a few others. Boltwoodite is highly radioactive and will fluoresce dull green in short- and long-wave ultraviolet light.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/boltwoodite.pdf

Formula
KUO2(SiO3OH)┬ĚH2
Crystal System
Monoclinic 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous - Pearly 
Color
yellow, light yellow 
Streak
white 
Class
Monoclinic - Sphenoidal 
Hardness
3.5-4 
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Boltwoodite from Rossing mine, Rossing, Swakopmund, Namibia

Boltwoodite
            from Rossing mine, Rossing, Swakopmund, Namibia

Slender, radial, prismatic, yellow crystals of Boltwoodite.

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Boltwoodite from Repete mine, San Juan Co., Utah, United States

Boltwoodite
            from Repete mine, San Juan Co., Utah, United States

Yellow powdery crust on mudstone matrix.

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