description: <p style="text-align: justify;">LOCALITY: Rogerley Mine, County Durham, England <br /><br />5 1/2" across <br /><br />This piece was traded from Cal Graeber in mid 2013. Cal was one of the principals of "UK Mining Ventures". This company mined the Rogerley Mine for green fluorite. The piece was traded out to Professor Stephen Smale in late 2013.</p> <p style="text-align: justify;"> </p> <p style="text-align: justify;">Photo by Matthew Webb of Melbourne, Victoria, Australia  </p>
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