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Fluorescent Rock: Willemite+Calcite+Franklinite

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Fluorescent Rock: Willemite+Calcite+Franklinite

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Quick Overview

Willemite, Calcite and Franklinite minerals in a rock that illuminates under UV light. Medium size


These rocks are from Sterling Hill Mine in Ogdensburg, NJ (US). The peculiarity of these rocks is their fluorescence. They are composed of three minerals: willemite, calcite and franklinite, however just willemite and calcite are fluorescent. What it is also noticeable is they are phosphorescent as well; they keep glowing in the darkness a few seconds after the source of light has ceased. The best way to look at these specimens is in a dark place under Short UV light. Willemite shows a green colour and calcite orange colour. It is your chance to get a spectacular rock! Sterling Hill Mine is closed and the specimens found there are collector's treasures.
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