Bayldonite, Tsumebcorite

An important specimen from the Tsumeb Mine, Namibia, featuring bright green aggregates of Bayldonite alongside very small but gemmy yellow crystals of the extremely rare mineral Tsumebcoite. The identity of both species has been confirmed by Raman spectroscopy, and the specimen is accompanied by the original study card from the analysis.

Bayldonite, a lead–copper arsenate, is well known from Tsumeb and often forms attractive, vibrant green crystalline aggregates. In contrast, Tsumebcoite is exceedingly rare, first described from this very mine and still known from only a handful of specimens worldwide. A secondary phosphate–arsenate species, it typically occurs as microcrystals and is seldom available in crystallized examples such as this.

This specimen can be appreciated both in hand and looks great when viewing it under magnification. This specimen illustrates the remarkable mineralogical diversity and complexity of the Tsumeb deposit. It's a fine opportunity to acquire a documented and analyzed association of Bayldonite with Tsumebcoite, representing one of the mine’s rarities that holds both aesthetic and historic value.