Strontianite and Calcite     Winfield Quarry, Winfield, Pennsylvania.  Ex. Dr. Steve Chamberlain collection.  This fine matrix specimen measures 9 x 7.6 x 6.5 cm and has transparent calcites to 1.5 cm (they are also twinned) and translucent strontianite ball to almost 2 cm each.  There is no damage to the primary crystals.  This is an exceptional example of the material to be fund at this quarry.  $150