Detailed Description

This piece features intergrown bournonite twins on matrix. The bournonite crystals are classic “cogwheel” twins and the main crystal is absolutely superb. The crystals are sharp and lustrous. In excellent condition, very minor chipping. The main crystal stands right out off the matrix and is very 3-D – this is top form for bournonite from anywhere in the world, a truly fantastic piece.

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.