• Fluorite
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Fluorite

$400.00   €333  £300.00 approx.  

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

ID: CC20926
This ex-matrix, twinned interpenetrant pair of Fluorite crystals are splendid for their subtle colour zonation and associated interesting fluorescent properties. This impressive specimen is from The Bull Vein at Lady Annabella mine, near Eastgate in Weardale. The elongated cubes measure 2.5 x 2.5 x 1.9 cm and 1.9 x 1.7 x 1.5 cm and have mirror-smooth faces with a variable bright glassy to dull-waxy lustre and are bounded by razor-sharp edges. Both crystals exhibit three distinct colour zones across their outer 4 mm shell, beginning with a gemmy amber-yellow core, there then follows a dark pencil-thin line defining the start of the outer zoning consisting of a straw-lemon band then an outer colourless to creamy layer. Under LWUV the outer colourless and inner zoned layers fluoresce deep lilac, while the central straw-lemon band fluoresces bright lavender.

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
3.2 × 3.7 × 3.0 cm
Categories
Fluorite and Halides, Latest Additions
Locality
The Bull Vein, Lady Annabella Mine, Eastgate, Weardale, County Durham, England, Europe

Minerals on Specimen

Minerals on specimen
Fluorite

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