A dynamic formation of White Prehnite and Chalcedony with minor Heulandite and Apophyllite on Basalt from the legendary O&G Southbury #2 Quarry, Southbury, CT, USA. This rare white prehnite almost completely free of iron impurities. Closed to collecting in 2000. 4" x 1.5" x 2.5", 6.5 oz.