Fluorite
specimen number:
1655438
location:
Old Tor Mine, Castleton, Derbyshire, England, UK
description:
Sparkling micro crystals of purple fluorite across one side of matrix with minor barite. This is the variety known as Blue John. Blue John fluorite is a rare variety of fluorite found only in Derbyshire, England, known for its distinctive curved bands of purple, blue, and yellow. This is mostly massive material, crystals are not terribly common.
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