Canar clach chruth-atharrachail ri cloich aig an robh cruth na cloiche tùsanach ag atharrachadh fo bhuaidh a' phròiseas metamorphism (atharraich den chruth).
Ann an eòlas-talmhainn bhiodh sin a' tachairt fo teas eadar 150° is 200°C agus fo bhrùthadh na bu mhotha na 1500 bars, gheibhte atharrachaidhean fiosaigeach a bhiodh maireannach. Bhiodh meud nan clachan ag atharrachadh agus bhiodh gluasad a' phàtrain mhòir, mar a bhios iad nan laighe, ann. Biodh am pàtran no an structar am broinn nan clachan air caochladh gu mòr cuideachd.
Tha iomadh adhbhar ann airson a' phròiseas seo:
Seo cuid de na h-eisimpleirean:
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