Great Longstone China Clay Pit
Longstone Downs, St Mewan, Cornwall, England, UK
Large china clay pit worked for kaolin clays.
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I can’t find too much information about this site; it appears to still be active and operating by Imerys.
The site occasionally produced(s?) specimens of opal and quartz, including amethyst. I do not know if this was a one time thing or pockets of mineralisation are common.
I did get a few older specimens of smoky quartz labelled as being from this location – they were exceptional.
Further reading
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