This is, I am told, one of the richest known examples of this extremely rare bismuth and uranium-containing mineral species. The mineral is available in "reference quality," so the question is whether people will pay extra for the quality. I am told the quality warrants it by those who know more, but I can say that I have seen so FEW of these for sale in ANY quality, that with the beauty and the rarity it is surely a desirable specimen. From an exchange in 1973 with the collector.