Introduction: kyanite has two polymorphs (minerals with the same chemicial composition but a different crystal structure) sillimanite and andalusite, each forming under particular temperature and pressure conditions. Kyanite is typically an attractive blue colour and forms under the highest pressure metamorphic conditions of the three polymorphs in peletic rock.

Occurrence in Wales: no primary metamorphic occurrences of kyanite are known from Wales, although it has been recorded as a detrital mineral in glacial sands. Strahan et al. (1909) identified kyanite from glacial sands exposed south of Castell-tôch, near Pendine, Pembrokeshire, and Griffiths & Stuart (1940) reported kyanite as a component of glacial sands at Ludchurch, Pembrokeshire.

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