30109 Bournonite, Pyrite, Machacamarca subdistrict, Machacamarca mining district (Colavi mining district), Cornelio Saavedra Province, Potosí, Bolivia
Two twinned bournonite crystals on matrix. Largest crystal 33x21x5mm.
Two twinned bournonite crystals on matrix. Largest crystal 33x21x5mm.
Tetrahedrite and bournonite crystals on a matrix of sphalerite, pyrite and chalcopyrite.