Fulbrightite
Fulbrightite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ca(VO)₂(AsO₄)₂·4H₂O.
It crystallizes in the triclinic crystal system (space group P1). It is a member of the Sincosite structural group.
Key properties: Mohs hardness 2.5; specific gravity 3.12; Colorless to pale green streak; Vitreous to pearly luster; optically biaxial.
IMA symbol Fbg, IMA status: approved, named in 2019.
A low-temperature secondary phase on montroseite- and corvusite-bearing sandstone.
It is found associated with Pascoite, pharmacolite, gatewayite, morrisonite, packratite, vanarsite (Packrat); kottigite, zeunerite, babánekite, hloušekite.
The mineral was named to honor Jess W. Fulbright, Jr., of Nucla, Colorado (b. 1958), Safety Director for Energy Fuels Inc., a company involved in the acquisition, exploration, development.