page_title: Boltwoodite
section_title: Discovery and occurrence
hierarchical_section_title: Boltwoodite / Discovery and occurrence
caption_attribution_description: English: Boltwoodite Locality: Goanikontes Claim, Arandis, Swakopmund District, Erongo Region, Namibia (Locality at mindat.org) The orange to yellow boltwoodite is contrasted on the best possible matrix from this locality, a contrasting black quilt of dark calcite. 5.2 x 3 x 2cm Deutsch: Boltwoodit Fundort: Goanikontes Claim, Arandis, Distrikt Swakopmund, Erongo, Namibia (Fundort bei mindat.org)
context_page_description: Boltwoodite is a hydrated potassium uranyl silicate mineral with formula HK·1.5. 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.
context_section_description: 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.
caption: Orange to yellow boltwoodite on dark calcite matrix from Namibia (size: 5.2 x 3 x 2cm)
exif: {}