Detailed Description

A group of gorgeous classic “cogwheel” twins of bournonite. The crystals are sharp and with good lustre – the prism faces are mirror-bright. These are wonderful cogwheels. In excellent condition, virtually pristine – one pin-prick sized nick at the back of one crystal if you are seeking it out, and a contact on the backside of one of the smaller crystals, otherwise it’s a 360-degree piece. A fantastic 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.