This is an unusual specimen of wodginite. It is completely terminated and clearly grew in a constrained environment, such that it is unevenly-developed. It has a coating of black over much of the specimen – not sure if this is a second generation of wodginite or another mineral. The left/lower edge is chipped. An interesting piece of this uncommon mineral.
About These Wodginites
Wodginite is not a common mineral, and it is quite difficult to acquire good crystals. These ones are from a recent find that produced a small number of specimens. Their idetification has been confirmed at the University of Arizona, and, along with subsequent EDS work, it has been established that of the various members of the wodginite group, they are wodginite.