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Boltwoodite: HK(UO2)(SiO4)·1.5(H2O)
Comments: Sprays of boltwoodite covering matrix. Location: Rossing, Namibia. Scale: Size Not Given. © John Veevaert
Comments: Bright yellow, prismatic crystals of boltwoodite. Location: Rössing mine, Swakopmund District, Namibia. Scale: Picture size 2.5 mm. © Paul M. Schumacher
Comments: Yellow, globular aggregates of boltwoodite on a ferruginous matrix. Location: Repete Mine, San Juan County, Utah, USA. Scale: See Image. © Jeff Weissman / Photographic Guide to Mineral Species