Datolite    Prospect Park, Passaic County, New Jersey.  Ex. Dr. Steve Chamberlain.  This is an outstanding NJ thumbnail specimen!  It measures 3 x 2.6 x 2.1 cm.  The big crystal sitting in high relief on the top of the piece is 2.5 cm long.  Most of the surfaces have a white tint due to inclusions.  Unincluded areas will be seen to be transparent and green in color.  The piece is damage-free and a floater with only the tiniest of contacts on the base... it will take some searching to find it.  $225