I had personally never seen a California Hubnerite before. This was a total surprise to me, when I noted the label. I am still surprised, as I lived in California for 8 years and never heard of such a thing. But here one is, and cabinet sized no less. It was obtained by dealer Scott Kleine from an old collection recently, and seems legit - it certainly looks like no hubnerite I have seen from elsewhere, for combination of style and matrix. The matrix matches that described on MINDAT as: a hydrothermal vein deposit hosted in andesite, rhyolite, tuff, basalt, and sedimentary breccia (http://www.mindat.org/loc-3431.html
). A curiosity for the collection of US minerals and tungstates! NOTE - I was recently told that collector Neil Prenn supplied many of these to the market in the 1980s, when working the property as a mining consultant.