It is found in one area near St Austell, Cornwall in the United Kingdom.
It was the last UK sourced feldspathic material to be commercially extracted.
[2] A number of varieties, named on the basis of their hardness and physical appearance, were produced.
[3] Maximum production was achieved in the early 1950s, with around 70,000 tonnes per annum.
[6] Relatively similar material has been mined, and exported to England for ceramics use, in the Isle of Man and Jersey.