• Fluorite
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Fluorite and Halides

Fluorite

$2,000.00   €1,640  £1,480.00 approx.  

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

ID: CC20922
This rather complexly twinned Fluorite crystal from Sherry Twins Pocket at Lady Annabella mine is ex-matrix and of a beautiful light clove-sherry brown with a richness of amber-honey. The two largest interpenetrant twinned pair measure 3.4 x 2.9 x 2.6 cm and 1.9 x 1.5 x 1.4 cm, with a third crystal of almost the same dimensions as the latter, forming another twin with the common large cube. The crystal is semi-transparent with its base grading from translucent to opaque. The crystals display subtle zoning around their edges over a bandwidth of about 3 mm. At least three bands are recognisable, with an outer lilac-tinged colourless shell, followed by pale lilac and then pale sea-green. The crystal faces display micro-furrowed crevices following concentric growth patterns and the concave impressions of former micro Quartz crystals, now appearing as hollow epimorphs. Under LWUV the edges fluoresce as a bright lavender-white framework containing much darker, blackish-purple square and rectangular cores.

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
5.0 × 4.3 × 4.2 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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