Introduction:

cymrite is roughly equivalent to hydrated celsian and appears to form in barium-rich rocks under conditions of low grade metamorphism. Experimental work suggests that it forms from baryte under alkaline conditions and breaks down to celsian and water at around 300°C and 3 kb (or lower temperatures at low pressure) (Hsu, 1994).

Occurrence in Wales:

cymrite was first described from Benallt Mine, near Rhiw, Llŷn, North Wales (Campbell Smith et al., 1949) and this locality remains the only known Welsh occurrence of the mineral. Campell Smith et al. (1949) examined material collected by A.W. Groves, who had recently surveyed the mines, but only minute amount of cymrite were present, such that two specimens, from different locations in the mine, were required to characterize fully the new mineral. This type material is held in the Natural History Museum (B.M. 1944, 36 and B.M.1944, 48).

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