Wolfie Pocket

January 2018

Named for Ian and Diana's dog Wolfie, this large cavity in the Greenbank vein was discovered towards the close of 2017, with specimen extraction in January 2018. The pocket is characterised by its deep gemmy-green and perfectly formed cubic Fluorite crystals, many as interpenetrant twins and punctuated with occasional finely developed lead-grey Galena crystals.

Named for Wolfie, Ian and Diana Bruce's pet lurcher cross and chief Rock-Hound!

Figure: Mr Wolfie Bruce, for whom the Wolfie pocket is named.

Figure: Fluorite, Wolfie Pocket, Rogerley mine, 9.7 x 4.5 x 3.8 cm. Fluorite as primarily interpenetrant cubic crystals exhibiting intense daylight fluorescence, so characteristic of classic Weardale specimens. The central crystal shows distorted development, in that its three axes are each of differing length. The crystal faces exhibit detailed growth patterns, some of which a highly lustrous and others finely etched and non-reflective. Many crystals have beautiful internal colour zoning with nested bands of green and purple.

Figure: Fluorite, Wolfie Pocket, Rogerley mine, 10.3 x 9.8 x 5.9 cm. Fluorite in studio light (left) and in short wave ultra-violet (SWUV) (right). Modern photographic studio lighting uses daylight colour temperature illumination to reveal true mineral colours, but wavelengths are restricted to within the visible spectrum and do not extend as far as UV. Fluorescence is only activated by the higher energy levels present in the UV bandwidth.