Kegelite

Kegelite is a complex silicate mineral with formula Pb8Al4Si8O20(SO4)2(CO3)4(OH)8.

It was first described in 1975 for an occurrence in the Tsumeb Mine, Tsumeb and named for Friedrich Wilhelm Kegel (?-1948), Director of mining operations at Tsumeb. It occurs in a deeply oxidized deposits in Tsumeb. Associated minerals include quartz , mimetite , anglesite , melanotekite It has also been reported from the Zeehan, Sarpsberg