Martite     Bancroft, Ontario, Canada.  Ex. John Davis collection.  This pieces measures 7 x 4.3 x 1.8 cm and shows two distinct generations of crystals.   The first generation are large, crude, etched crystals to over 2 cm each.  The second generation are lustrous, well formed, yet smaller crystals on the surfaces of the first generation crystals.  There is smoky quarts in poorly formed blebs throughout.  I'm not sure on a more specific location for this specimen.  $70