Microscopic veinlets carrying small euhedral aeschynite crystals occur in Ordovician rhyolite outcrops.(Howells et al., 1991). Although not fully characterized, work done to date suggests that it is highly likely to be aeschynite-(Y).
Howells, M.F., Reedman, A.J. & Campbell, S.D.G., 1991. Ordovician (Caradoc) marginal basin volcanism in Snowdonia (north-west Wales). HMSO for the British Geological Survey, 191pp.
Grid reference given is for the summit of Carnedd y Cribau, not a specific mineral location
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UK OS Grid Reference: SH675534
Map Reference: 53°3'39"N , 3°58'38"W
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1 entry listed.
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