Fluorite
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Fluorite from the Greenlaws Mine, County Durham, England, measuring 65 × 50 × 44 mm and weighing 193 grams. A good weighty piece from the heart of the North Pennine Orefield.
Fluorite, calcium fluoride CaF2, isometric, is the signature mineral of the North Pennine Orefield, where it formed in Carboniferous limestone veins alongside Galena, Sphalerite and Baryte, typically as cubic crystals ranging from colourless and pale yellow through to the deep purples the district is best known for. The Greenlaws Mine, in the Rookhope area of the orefield, is one of many smaller workings across the district that have, between them, made North Pennine Fluorite one of the most collected mineral suites in British mineralogy.
A named-mine North Pennine Fluorite like this gives a collector a specific point of reference within a district whose material varies considerably from one working to the next. This piece is from the David Vince Collection.