Tourmaline, Quartz, Fluorapatite     Dafoe Property, Pierrepont, St. Lawrence County, New York.  Collected by Michael Walter, 2019.  These tourmaline crystals that are believed to be chemically similar to those from Powers farm, showing zonation from their outer surface of dravite, NaMg3Al6(Si6O18)(BO3)3(OH)3OH  to interiors of fluor-uvite CaMg3MgAl5 (Si6O18)(BO3)3(OH)3F.  The crystals are up to 1.5 cm each and form a grouping that measures 9.1 x 8 x 4.7 cm.  One display face on this somewhat triangular shaped specimen is coated by tourmalines, gray quartz, and sharp light green to white fluorapatite crystals.  The fluorapatites are much denser and more nicely formed than is typical for the location.  The piece is in excellent condition as can be seen but does have minor contacts or chips on a few tourmalines. This is a fine specimen for the location and displays several of the most important species for which the locality is well known.  $190

Tourmaline, Fluorapatite, Quartz

SKU: GD-0939
$190.00Price