Turneaureite :: Locality: ZCA No. 4 Mine (St Joe Mine), Balmat, Balmat-Edwards Zinc District, St. Lawrence County, New York, USA :: Dimensions: 20.5 cm x 9.4 cm x 4.5 cm :: Turneaureite is a rare Apatite Group species, rich in arsenic. This large layered block contains seams of turneaureite that fluoresce bright orange under SW UV light. The piece is from the well-known ZCA No. 4 Mine at Balmat, the Co-type Locality. Not pretty to look at, but certainly a large and important New York and species rarity.