Sterling Hill sphalerite and willemite

Sphalerite: FL Tangerine-orange
Willemite: FL Green
Franklinite: Non-FL

This gorgeous Sterling Hill sphalerite came from the Yuhasz collection. I bought it from the Franklin Mineral Museum in the late 1990's.

There was a great deal of blue in the original photos due to reflected visible light.  I retouched most of it away to give a better representation of the rock's fluorescence. 


Above photo taken in longwave (350 nm).  Some of the blue is fluorescence (cleiophane), but some is reflected visible light from the UV lamp.


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