• Fluorite with Calcite
  • Fluorite with Calcite
  • Fluorite with Calcite
Calcite

Fluorite with Calcite

$700.00   €592  £510.00 approx.  

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

ID: CC20935
Translucent straw-yellow cubic crystals of Fluorite to 2 cm on edge cover an iron-rich altered limestone matrix with a part-overgrowth of drusy cream Calcite. Perched on top of the Fluorite is an up-turned spray of opaque, off-cream and tan Calcite crystals, forming a duck’s foot array of splayed and webbed crystals to 8 cm long. These more unusual Fluorites with Calcite sprays come from the Harvest Pocket at Lady Annabella mine and are very distinctive. Under LWUV the Fluorite fluoresces bright bluish-purple with the non-fluorescent Calcite forming an intensely dark-cloaked tower. A splendid and large size cabinet specimen from Eastgate.

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
10.0 × 14.0 × 7.5 cm
Categories
Calcite, Fluorite and Halides, Latest Additions
Locality
Harvest Pocket, Lady Annabella Mine, Eastgate, Weardale, County Durham, England

Minerals on Specimen

Minerals on specimen
Calcite, Fluorite

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