Westvaco mine, Green River formation, Sweetwater Co., Wyoming, USA
Cabinet, 11.3 x 7.2 x 1.8 cm
Ex. Philadelphia Academy of Natural Sciences
This is a HUGE crystal for the species, showing an 8 cm-tall subtermination leading up to the main termination above. These are giants for the species and it is an attractive specimen from a state which frnaky doesn't give us a lot fo great mineral species. It is coated in some edges by another white, powdery mineral species (perhaps norsethite but not yet tested).