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PhotosWavellite - Hensbarrow China Clay Pit, Stenalees, Treverbyn, St Austell District, Cornwall, England, UK

6th Feb 2014 06:06 UTCPeter Haas

06251210014977371045678.jpg
Wavellite
High Down Quarry, West Buckland, North Devon, Devon, England, UK
Copyright © Weinrich Minerals, Inc.
Matrix appears to be some sort of shale (and reminds of the South Molton specimens, as does the entire specimen).

6th Feb 2014 08:36 UTCDale Foster Manager

I would say from my own experience that this Wavellite is not from the Hensbarrow / Gunheath area which is a granite dominated area with significant zones of kaolinisation. The matrix and appearance is totally different to all the material I have seen from there - mostly quartz dominant host matrix. Also the Hensbarrow / Gunheath Wavellites I have seen tend to be pretty much colourless whereas this material has a greenish tinge to it.


There has been an occurence of Wavellite on a metasedimentary clay slate locally termed 'killas' at the Castle-an-Dinas tungsten mine near St Columb, but this specimen really looks like the material from High Down Quarry, Filleigh near South Molton in Devon as mentioned above.


I would say it has been assigned to the wrong locality.

6th Feb 2014 12:43 UTCTom Cotterell

I agree with Dale. The matrix precludes this specimen as being from the China Clay pits. It shows all of the characteristics of High Down Quarry material. An article describing all of the wavellite occurrences in Britain is available in the UK Journal of Mines and Minerals (No. 28, 2007).


Amgueddfa Cymru - National Museum Wales
 
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