Uranopilite
# Uranopilite

Uranopilite is a minor ore of uranium with the chemistry $(UO_2)_6SO_4(OH)_6O_2·14H_2O$ or, hydrated uranyl sulfate hydroxide.

As with many uranyl minerals, it is fluorescent and radioactive. It is straw yellow in normal light. Uranopilite fluoresces a bright green under ultraviolet light. Uranopilite contains clusters of six uranyl pentagonal bipyramids that share equatorial edges and vertices, with the clusters cross-linked to form chains by sharing vertices with sulfate tetrahedra. In uranopilite, the chains are linked directly by hydrogen bonds, as well as to interstitial $H_2O$ groups.

Uranopilite is associated with other uranyl minerals such as zippeite and johannite and, like them, is usually found as an efflorescent crust in uranium mines.

Notable occurrences include:

* Wheal Owles, Cornwall, England
* San Juan County, Utah, US
* Northwest Territories, Canada
* Bohemian region of Europe
