Excellent twinned Sphalerite crystals decorated by Chalcopyrite and Galena from 9th Septemvri mine, Madan ore field, Bulgaria. Displays black Sphalerites octahedrons with good luster, complex structure and superb twinning. Yellow Chalcopyrites grow above. Small Galena cubes are seen too. In good condition – some small nicks and contacts.

Marvelous!