Tourmaline and Quartz The Historic Hilltop Site, Powers Farm, Pierrepont, St. Lawrence County, New York. Collected by Michael Walter, 2015. These tourmalines have been tested and shown to be dravite on their outsides and to have cores of fluoruvite (reference Chamberlain, S.C., Robinson, G. W., Walter, M. R., Chiarenzelli, J. R., Lupulescu, M. V. and Bailey, D. G. 2016.  Collector's guide to the tourmaline of Pierrepont, New York. Schiffer Publishing, Ltd., Atglen, PA.  p. 114-117).  Here we have lustrous, large crystal with minor quartz. 5.8 x 5 x 3.5 cm overall. No damage and only a couple small areas that have healed. $160