Brick Red Willemite (troostite) and Calcite, Franklin, New Jersey


This specimen, from Franklin, New Jersey, is of mixed composition and contains brick-red willemite (troostite), white and greenish/white willemite, white calcite, and black grains of franklinite.  Under short wave UV the troostite and willemite fluoresce bright green and the calcite shows a typical red response.  The white willemite is also phosphorescent.  The size of this specimen is 54 x 52 x 51 mm, and it weighs 174 grams.



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