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Collyweston stone slate
Collyweston stone slate is a traditional roofing material found in England.
It is not a proper slate but a limestone found in narrow beds. The slates are quarried near the village of Collyweston in Northamptonshire, near Stamford and close to the borders of Lincolnshire and Rutland. It is considerably heavier than slate. Traditionally the mined stone was left outside for three winters until the frost revealed layers that could be broken into flat slates.
In 2015 a planning application to re-open a slate mine in Collyweston was approved; the slate mines have not been used since the 1960s.〔("Collyweston slate mine set to reopen after bid approved" ) BBC News 16 June 2015〕
==See also==
*Lincolnshire limestone
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