synchysite rosette

Partially altered synchysite rosette (2 mm across) from Gloddfa Ganol Quarry, Gwynedd. Photo: T.F. Cotterell.

Rhosglwm o syncysit (2 mm ar draws), wedi'i trawsnewid yn rhannol, o Chwarel Gloddfa Ganol, Gwynedd. Llun: T.F. Cotterell.


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