Large cabinet specimen of mammillary translucent prehnite from the Upper New Street Quarry in Patterson, Passaic County, New Jersey. Largely a floater, the display side is in excellent condition, the underside is less attractive. Has minor fine coating of micro pyrite (?) crystals on underside, very cool under the loupe. Measures 6.5 x 4.5 x 3 inches ( 16.5 x 11.4 x 7.5 cm).