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Gunheath China Clay Pit, Stenalees, Treverbyn, St Austell District, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 22' 45'' North , 4° 48' 27'' West
Latitude & Longitude (decimal): 50.3791666667, -4.8075
UK National Grid Reference:SX004571
Plancheite supposedly collected here in 1958 by Arthur Kingsbury (1906-68) is now considered "very doubtful" and probably from Arizona. This is one of a number of likely or definitely falsified Kingsbury localities.

Given the iron-rich nature of the mineral assemblage and its manganese-poor character, the strunzite should be validated from the more likely ferrostrunzite possibility.

Mineral List

86 entries listed. 68 valid minerals.

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.


- Williamson, B.J., Stanley, C.J., and Wilkinson, J.J. (1997): Implications from inclusions in topaz for greisenisation and mineralisation in the Hensbarrow topaz granite, Cornwall, England. Contributions to Mineralogy and Petrology 127, 119-128.
- Elton, N. J. (1998): Barbosalite, frondelite and other phosphates from Gunheath China Clay Pit, St Austell, Cornwall, England. Journal of the Russell Society 7, 15-18.
- Ryback, G., Hart, A.D., and Stanley, C.J. (2001): Journal of the Russell Society 7(2).

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