Home > Type Locality Minerals – September 21 > MS1251 Billietite on Uranophane

Billietite on Uranophane - Sold


Billietite a hydrous barium uranium oxide mineral and uranophane is a hydrous uranium silicate. Vaes (1947) named billietite in honor of Valère L. Billiet (1903-1945), crystallographer at the University of Ghent, Belgium. Finch et al. (2006) refined the crystal structure of billietite, demonstrating eight water molecules for formula unit.

Billietite forms equant orange microcrystals to 1 mm scattered over acicular uranophane. The matrix is a sandstone with a 4 by 1.7 cm coverage of uranophane. A good representation of the species.