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Gew Graze (Gue Graze), Mullion, Lizard Peninsula, Cornwall, England, UK

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A talc deposit within a granitic dyke cutting through serpentinite. This occurrence is remarkable, since the chemical changes required to form talc from granite are much greater than those needed to form talc from serpentinite. Thus, Hall (1979) suggested that the talc may be a product of intense Mg metasomatism of the granitic rock. In fact, all deposits of massive talc that have been found elsewhere on the Lizard peninsula occur either within acid portions of the Kennack gneiss or in its close vicinity. As pointed out by Power et al. (1997) however, relict structures seen in the massive talc suggest affinities with peridotites rather than gneiss, and therefore, the talc may be a product of Si metasomatism of peridotites instead that are enclosed by, or in proximity to, acid rocks.

Note: This is a historic occurrence which isn't accessible anymore since the early 20th century.

Mineral List

2 entries listed. 1 valid mineral.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Hall, A. (1979): Rodingites in the Lizard complex. Proceedings of the Ussher Society 4, 260-273.

Power, M.R., Shail, R.K., Alexander, A.C., and Scott, P.W. (1997): Alteration and vein mineralisation within the Lizard complex, south Cornwall: constraints on the timing of serpentinisation. Proceedings of the Ussher Society 9, 188-194.

矿物 and/or 产地  
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