Tha clach-ghainmhich na seann ruadh-chlach air a dèanamh de smùrach chreagan gainmheach.
Tha e à clach-èite agus feldspar.
Is ann bho fhuigheall na talmhainn, a chruadhaich fo chuideam tro na linntean, a tha sinn a' faighinn creagan dàrnach mar a tha seann ruadh-chlach-ghainmhich. Chaidh cuid mhòr de chlach-ghainmhich ann an Alba a cruthachadh anns an linn Deabhonianach.
Tha bailtean leithid Peairt cha mhòr uile gu lèir air an togail le cloich-ghainmhich. Tha an dà chuid togalaichean aosta agus togalaichean ùra am Baile Ùr Dhùn Èideann mar as trice air an togail leis an t-seòrsa cloiche seo.Is ann à clach-ghainmhich a tha a' chathair-eaglais am Baile na h-Eaglaise, Arcaibh.
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