QUARTZ ON PYRITE

ABOUT THE SPECIMEN

Brilliantly lustrous pyrite takes center stage on this small cab specimen, dramatically framed by radiating quartz crystals. The pyrite's complex surface features natural cavities, later filled by both clear and smoky quartz crystals, creating an intriguing interplay between the two species. This unique crystallization sequence produces a fascinating play of light, as the nested quartz crystals change the roll of the luster across the front. Essentially all of the quartz on the display side is pristine, and any broken points can easily be hidden out of view. This is those specimens that, for composition and peculiarity, stands as more than the sum of its parts.

MORE INFO

Trepča is a distal Pb-Zn-Ag skarn developed in Upper Triassic recrystallized limestone, formed in two stages: a high-temperature prograde phase dominated by clinopyroxene, followed by a retrograde open-system stage that deposited pyrite, quartz, carbonates, and the bulk of the sulfide ore at around 350°C. Pyrite at Stari Trg is notable for occurring in two distinct modes - sharp cubic and pyritohedral crystals on quartz matrix, and blocky hexagonal pseudomorphs after pyrrhotite that rank among the finest examples of that replacement known anywhere. The quartz accompanying both forms tends toward slender, transparent prismatic crystals with excellent terminations, sometimes arranged in radiating hedgehog clusters that contrast sharply against dark sulfide matrix. Trepča has been mined intermittently since Roman times and industrially since the 1920s, with specimen quality varying considerably by horizon and time period; pre-war material from before 1998 is particularly sought after as the mine flooding and subsequent reopening in 2005 disrupted access to previously productive levels. The mine remains active, and fine pyrite-quartz combinations still emerge periodically, though inconsistently.