A truly shocking, museum-level example of one of the ultimate rare species finds in the USA, because the crystals from this find were 10,000 times bigger than the micro-crystals found elsewhere. This is from the type locality, second discovery there, by Jack Zektzer. I actually remember seeing this for the first time in the late 1990s at Tucson, when Dave Wilber showed it to me and asked if I could guess what it was (I failed). He promptly sold it to Joe Freilich, and it later passed (through us) to Paul Stahl's collection. Paul laser-focus specialized in ultimate miniature-sized examples of large crystals of rare species, like nobody else; and he has owned this since the early 2000s, so it has never been out on the market. An enormously important example of a very rare USA-origin best-of-species mineral species. To my knowledge, this is one of the 2 or 3 best known, with others in the Smithsonian and the MIM Museum Beirut (and both were also from Jack's collection).
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