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Fluorite

$800.00   €654  £590.00 approx.  

This specimen is priced in US dollars, all other prices are approximate.

ID: CC20932
This fabulous pair of interpenetrant Fluorite twins is from Sherry Twins Pocket at Lady Annabella mine and in the case of each twin, one crystal dominates the other and is far more transparent and gemmy than its twin. These two, showy, part-crystals, measure 3.2 x 3.0 x 2.7 cm and 3.8 x 2.5 x 2.0 cm, the latter having one cleaved corner. Both crystals are extremely gemmy and appear in various hues of lemon-honey yellow in daylight and a more golden-honey in artificial light. Both exhibit wonderful zoning with various concentric bands of lemon, lilac, colourless and honey. The crystal edges are sharp, and all faces are mirror-smooth with a waxy yet glassy lustre. This is a magnificent Fluorite in terms of clarity, colour and zonation and in LWUV the crystal edges fluoresce bright lilac with inner deeper purple areas within this wonderfully-defined framework.

The Lady Annabella mine began specimen recovery operations in July 2020 within the former Eastgate Quarry, previously known as the Blue Circle Cement Quarry. This quarry began in the early 1960s, working an exposure of the Great Limestone, a major formation of Carboniferous age (Pendleian Substage), found across much of Northern England. Following uplift and fracturing, subsequent Fluorite mineralisation pervaded this area of County Durham, in the form of sub-vertical veins and near-horizontal metasomatic flats. Metasomatism is the chemical alteration of rock by hydrothermal fluids. Over the past 55 years, Fluorite from this quarry has become famous amongst collectors for its wide range of colours, colour variations and zonation. In just its first five months of operation, the Lady Annabella mine has produced a magnificent range of Fluorite specimens, many of which are colour variants and mixtures never before seen at this locality, nor even in the other famous mines throughout the Weardale Valley.

Details

Dimensions
6.5 × 8.3 × 4.8 cm
Categories
Fluorite and Halides, Latest Additions
Locality
Sherry Twins Pocket, Lady Annabella Mine, Eastgate, Weardale, County Durham, England, Europe

Minerals on Specimen

Minerals on specimen
Fluorite

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