This type of material was one of the things being discovered while I was in the area.  One of the holes at the first camp on the main trail leading up the mountain had just started to produce schorl included quartz, as well as a number of these interesting fluorite formations.  This is the best example I saw during the trip-- most were somewhat smaller, and for obvious reason: the delicate formations are easily shattered during extraction.  Somehow this one was preserved-- maybe the muscovite acted as some sort of shock absorber....