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Tetradymite from
Clogau St Davids Mine (Clogau Mine; St David's Mine), Llanelltyd, Gwynedd, Wales, UK

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Classification
Locality type:	Mine
Species:	Tetradymite
Formula:	Bi₂Te₂S
Comments:	Bevins (1988): "Reported as occurring at Clogau St. David's Mine, Dolgellau, Gwynedd. This was later thought to be tellurbismuth (Kingsbury, 1965). However, subsequent analysis has shown that both tellurbismuth and tetradymite occur at Clogau Mine, Gwynedd, the latter occurring in intimate association with tellurbismuth. (J.W.G. Gilbey (1968) unpublished Ph.D. thesis, University of London.) Electron microprobe analyses show that tetradymite from Clogau St. David's Mine consistently contains 8 wt. % Pb. [J. Naden (1986) pers. comm.)"
Confirmation
Validity:	Believed Valid
Data
Mineral Data:	Click here to view Tetradymite data
Locality Data:	Click here to view Clogau St Davids Mine (Clogau Mine; St David's Mine), Llanelltyd, Gwynedd, Wales, UK
Data Identifiers
Mindat Occurrence Record ID:	18518
Long-form Identifier:	1:3:18518:9
GUID (UUID V4):	0
References
University Museum Mineral Collection, Oxford (former collection of Dr. Hugo Müller). Smyth, W. (1866) Mining and Smelting Magazine, 1866, vol. 1, 359. Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 635-642 Phillips and Louis (1896) A treatise on ore-deposits, 293. *Rudler, F. W. (1905) A Handbook to a Collection of the Minerals of the British Isles* - Mostly selected from the Ludlam Collection, in the Museum of Practical Geology. 253pp.pages 130, 154-155 Maclaren, James Malcolm (1908) Gold: Its Geological Occurrence and Geographical Distribution. The Mining Journal. Andrew (1910) The Dolgelly gold-belt, Geol. Mag., p. 210. Dana, E.S. and Ford, W.E. (1932) A Textbook of Mineralogy, 4th Edition, 412.** Kingsbury, A.W.G. (1965) Tellurbismuth and meneghinite, two minerals new to Britain. Mineralogical Magazine and Journal of the Mineralogical Society, 35 (270) 424-426 doi:10.1180/minmag.1965.035.270.19 Bevins, R.E. (1988) Sixth Supplementary List of British Isles Minerals (Welsh). Mineralogical Magazine, vol. 52, n° 364, 121-124. *Cook, N. J.; Ciobanu, C. L.; Stanley, C. J.; Paar, W. H.; Sundblad, K. (2007) Compositional data for Bi–Pb tellurosulfides. The Canadian Mineralogist, 45 (3). 417-435 doi:10.2113/gscanmin.45.3.417*

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⇱ Tetradymite from Clogau St Davids Mine (Clogau Mine; St David's Mine), Llanelltyd, Gwynedd, Wales, UK

Tetradymite from
Clogau St Davids Mine (Clogau Mine; St David's Mine), Llanelltyd, Gwynedd, Wales, UK