Goodchild, of the Scottish Geological Survey, found wulfenite there in 1875 but the locality only really became of interest to collectors in the 1950s following the reporting of a suite of rare supergene minerals including bayldonite
, duftite, beudantite, carminite, lindgrenite and stolzite (the first authenticated British occurrence).
Associated phases were bayldonite
, duftite, gartrellite, agardite, mimetite and various arsenic-bearing members of the jarosite supergroup.
Finally, there are exhaustive tables, the fullest of which alphabetically lists all Tsumeb minerals with their formulas, cross-referencing each species to earlier textual discussion and photographs, and tipping off the reader on things like crystal sizes, the quality of the best specimens, and the rarity of each species in the mine (where bayldonite
is common, fluorite extremely rare).
Some of the other more common associates of mimetite are bayldonite
crystals, olivenite crystals in a variety of habits, white to gray smithsonite, and cerussite.
He was also the first to illustrate and describe mendipite and bayldonite
(Smale, personal communication).