Skeletal Galena, Chalcopyrite, Sphalerite and Quartz - 9th Septemvri Mine (Deveti Septemvri Mine), M
Skeletal Galena, Chalcopyrite, Sphalerite and Quartz - 9th Septemvri Mine (Deveti Septemvri Mine), Madan ore field, Rhodope Mts, Smolyan Oblast, Bulgaria -- source link
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