Harold Michel Collection Cerussite is among my favorite mineral species, and Tsumeb is certainly the king of cerussite. The myriad styles of twinning are fascinating. This one is the twinning style of the sought-after reticulated “snowflakes”, but with two dominant “wings”. A fine Tsumeb cerussite from the Harold Michel collection. Harold got this one from the Columbine Mineral Shop in Ouray, Colorado in 1969.