Willemite Crystal on Calcite Matrix, Sterling Mine, Sterling Hill, New Jersey

22.2.2020

A large, well-formed, red/brown willemite crystal sits on top of a matrix of white calcite, from the Sterling Mine, Sterling Hill, Ogdensburg, New Jersey.  This specimen measures 86 x 76 x 48 mm, and weighs 405 grams.

The photograph above shows the fluorescent response under short wave UV (254 nm).  The willemite fluoresces bright green and the calcite matrix shows a bright red/orange response.

 

As seen above, this specimen is also moderately fluorescent under long wave UV (365 nm).  The willemite shows a more subdued green response and the calcite fluoresces a magenta color.

 

Visible light image of the same specimen.

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