These specimens come from the type locality for kolwezite, a copper-cobalt carbonate. Most of the "kolwezite" pieces seen on the market don't have the 1:1 Cu:Co ratio required to call them that; they usually have a 2:1 Cu:Co ratio. Of all the ones I've analyzed (and there are quite a few), even the olive-green ones maintain this ratio. In this case, we can say, to be honest, they're cobalt-rich malachite specimens. Even so, the specimens are very aesthetically pleasing. If I ever find a 1:1 Cu:Co kolwezite, I'll probably find the grail...

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