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 Gallt y Wenallt itself, rather than being a specific mineral location.
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UK OS Grid Reference: SH642533
Map Reference: 53°3'33"N , 4°1'35"W
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