Sphalerite Borieva Mine, Madan District, Smolyan Oblast, ...
Description:
Sphalerite Borieva Mine, Madan District, Smolyan Oblast, Bulgaria 8.0 x 9.0 cm. Lustrous, black sphalerite crystals to 2.5 cm. with slender, transparent quartz crystals. Mined in 2006.
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