This is a pure cluster of Bournonite, without any matrix or such. The raw petroleum colour shines with sharp edged luster.
Extracted from Machacamarca district, Cornelio Saavedraprovince, Potosi department, Bolivia.
Dimensions: 11cm × 4.5cm × 8cm
Weight: 465 g.
Place of discovery: Machacamarca District
Location: Cornelio Saavedra Province - Potosi Department, Bolivia