“Twinned, pseudotetrahedral chalcopyrite crystals up to 25 mm with black sphalerite crystals and pyrite, embedded on matrix of colorless quartz crystals. Ex. Karel Bal Collection (2003) Specimen size = 112 x 66 x 63 mm.”

“Close-up: chalcopyrite crystal coated by second generation of tiny chalcopyrites and quartz. FOV: 40 x 28 mm.”

“Side view of specimen. ”