Dundasite is a very rare lead carbonate species. This relatively large specimen hosts the richest single amount of Dundasite I have seen on a Tsumeb piece. Normally the mineral is white from other locales, and seldom found in such color intensity. This is therefore not only pretty, but is a major example of this rarity. It was in an old African collection, and later comes from the Marshall Sussman Tsumeb collection. What is more, the intense blue crystal clusters of dundasite are perched on contrasting, stark white crystals of reticulated cerussite. The unusual bright white color of the cerussite is due to their alteration to hydrocerussite - probably a partial alteration, if not quite complete. A major rarity, worthy of showing in a display collection as well - That is my favorite kind of rarity. Joe Budd Photos