Green-yellow
sphalerite crystals in a stepped cluster, coated by a 0.1 mm thick brown
layer of the extremely rare species Lennilenapeite. The entire piece, when
backlit, is gemmy , translucent to transparent even through the coating.
Origin: Franklin Mine, Sussex County, New Jersey, U.S.A.
Sample size: 5 x 4 x 4 cm
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