A rare Tsumeb association piece out of the Tsumeb collection of Rob Smith! Here you have these sparkling little bright green crystals of dioptase, sprinkled over a bed of lead-rich (plumboan) calcites. very rare to see these two together, indicating a really unusual sequence of solutions that flowed through the pocket in which this piece formed. Of course, anything rare from Tsumeb gets a lot of attention these days.