Mineral description : Boltwoodite

Mineral class	Silicates : Nesosilicates : Uranophane group
Chemical formula	K2H2(UO2/SiO4)2.4H2O
Crystal system	Monoclinic.
Habitus	Massive as crusts or as acicular crystals.
Cleavage
Hardness	3.5-4
Density	3.6-4.3 depending of water contents.
Color	Yellow to pale yellowish, crystals transparent to translucent.
Streak	Pale yellow.
Luster	Vitreous to silky.
Description	A rare secondary uranium mineral.
Occurance	Often as thin crusts and surfaces on other rocks and in fractures.
Associates	Uranite, other uranium minerals.
Notes	Fluorescent. Strongly radioactive. Type locality : Pick's Delta mine, San Rafael Swell, Emery Co., Utah, USA
Locations	A rare mineral Västervik, in fractures or as surfaces on other rocks. Lilljuthatten, Krokom, Jämtland. Olden power plant, Krokom, Jämtland. Notable occurances outside Scandinavia Rossing Mine, Swakopmund District, Namibia. New Method Mine, San Bernardino County, California, USA. Arandis, southwest Africa.

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