Opaque and off white, compound calcite crystals sprout from a bet of small quartz crystals on a mound of matrix. These calcites reach 3 cm, are terminated, and exhibit brilliant red fluorescence under shortwave UV. The quartz points reach about 5 mm at most, and are translucent to transparent. A few tetrahedral chalcopyrite crystals, slightly iridescent and reaching about 5 mm, are also seen. Probably from the San Martín Mine. Sits perfectly for display without needing a stand. Minor, scatter chipping but overall condition is quite nice.