Tetrahedrite crystals from this Asturian mine are well known and prized by Spanish collectors. In this sample we have tetrahedral crystals, one of them predominant, in which the tris-tetrahedron shapes seem to point. Good size and partially covered by malachite. X ray diffraction analysis (we will send to the buyer) has shown the presence of digenite associated with the alteration of the tetrahedrite. A classic.