A complex group of sharp, twinned bournonite crystals. These crystals show the “cogwheel” twinning habit. The prism faces on these crystals are brilliantly lustrous with many complex steps. Up close it looks a bit like a machined landscape – very cool. On the back and the bottom, the piece shows recrystallized surfaces. In excellent condition (tiny nicks on the piece if you search for them, two at the very outer periphery). This is a stunning bournonite.
About These Bolivian Bournonites
These bournonite crystals are from the Viboras Mine, Machacamarca District, Potosí, Bolivia. The locality has produced excellent bournonite specimens over the years, but the finds are have been sporadic, often years apart. The nature of the bournonite has varied from one find to the next, and some of the bournonite has been of modest lustre, sometimes dull, and of varying sharpness/definition. This latest find has produced sharp, lustrous bournonite crystals of the finest quality, exhibiting the classic “cogwheel” twinning.