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Schist, Anglesey

schist hand specimen The rocks of Anglesey include many that have been deeply buried, heated and altered, a process called metamorphism.

These rocks at Porth Dafarch originated as silts and muds on a sea floor some 600 million years ago, Later, they became deeply buried, squashed, and heated to temperatures approaching 500oC. During this process, the rocks have re-crystallised to form shiny mica-schist.

Porth Darfach schist, Angelsey, North Wales

Phil Williams,

Phil Williams,

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