Sphalerite (variety cleiophane) with Quartz and Galena

Septemvri Mine (September Mine), Madan mining area, Municipio Madan, Rhodope Mountains, Smolyan Oblast  Bulgaria (1993)

Specimen size: 5.7 × 4.5 × 2 cm = 2.24” × 1.77” × 0.79”
Main crystal size: 1 × 0.9 cm = 0.39” × 0.35”