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Amgueddfa Cymru – Museum Wales
A light grey, cleaved, spotted siltstone. The 'spots' are poorly formed, metamorphic minerals (probably chlorite after cordierite and andalusite) which grew as a result of contact metamophism by an intrusive igneous body.
Site Name: Carreg Coetan Arthur, Newport: Pembrokeshire
Notes: From sealed Neolithic OGS near cut for F8.
