Geocronite is an uncommon lead, antimony, arsenic sulfosalt. This very rich and very rare, two-sided cabinet-sized ore specimen features a thick, layered vein of lustrous, metallic lead-gray geocronite in sulfide matrix. Ex. Bohemia Royal Museum and Joseph Vajdak Collections with labels. Vajdak is a noted Pribram collector and both labels indicate that the piece was collected in circa 1920 in the 24th Level of Uranium Mine #16 here. Weighs 572 grams or 1.25 pounds.