Dims: 5.0" x 3.9" x 1.3" (12.7 x 9.9 x 3.3 cm)
Wt: 12.6 oz. (356 g)
Lane Quarry, Westfield, Massachusetts, U.S.A.
This specimen's locality isn't the only unusual aspect that it has. It is made up of a crust of intergrown Prehnite crystals with excellent orthorombic tabular form- they are easily the largest Prehnite crystals that I have ever seen! Most of them measure about 0.1 x 0.1 x 0.1" (3 x 3 x 3 mm). Many are loosely aggregated into rounded "wheels", but just as many appear to be individual. The specimen is in generally good condition with moderate damage. The Prehnites have a pale green color with a hint of yellow, a vitreous to pearly luster, and are translucent. There is another material on the underside of the specimen that I cannot identify. It is heavily weathered and may be Prehnite in a different form. It is a very impressive specimen.