Viboras Mine, Machacamarca, Machacamarca District (Colavi District), Cornelio Saavedra Province, Potosí Department, Bolivia
This really is the finest specimen in the lot for my taste. The piece has an extremely large, very sharp, incredibly lustrous, showy, well-formed, highly aesthetic crystal group perched upon a microcrystalline Quartz matrix. This "cabinet" size specimen is one the finest matrix Bournonite specimens that I have seen from Bolivia.
(Crystal Group: 5.5 x 3 cm. across)
Reference:Bltd 1 Bour