• Fluorite with Calcite and Quartz
  • Fluorite with Calcite and Quartz
Calcite

Fluorite with Calcite and Quartz

$5,000.00   €4,222  £3,640.00 approx.  

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

ID: CC20919
This magnificent cluster of gemmy yellow Fluorite crystals is from The Bull Vein at Lady Annabella mine, near the village of Eastgate in Weardale. Cubic Fluorite crystals, typically 5 to 7 mm on edge, cover the slightly concave surface of an iron-rich altered limestone. These have then been overgrown by milky white drusy Calcite and then dusted with sparking micro-crystalline Quartz. Two beautiful interpenetrant twins sit at opposite ends of this bed, with the larger crystal of each twinned pair measuring 1.7 x 1.7 x 1.2 cm and 1.6 x 1.2 x 1.1 cm, respectively. A common characteristic is that twinned crystals develop to a considerably larger size than any of the associated single crystals. The twins are completely transparent and gemmy, and exhibit almost colourless cubes which grade to lemon centres. Viewed sideways on, normal to any given crystal face, the cube appears almost colourless, but when slightly rotated, become an acidic lemon with overtones of smoky-lemon and black. Under LWUV the Fluorite is mainly bright whitish-lavender, speckled lilac and surrounded by a black, non-fluorescent swath of Calcite. This is a choice and superb specimen.

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
4.8 × 8.0 × 3.4 cm
Categories
Calcite, Fluorite and Halides, Latest Additions, Quartz and Agate
Locality
Harvest Pocket, Lady Annabella Mine, Eastgate, Weardale, County Durham, England

Minerals on Specimen

Minerals on specimen
Calcite, Fluorite, Quartz

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