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Thomsonite-Ca from
Marchlyn Mawr, Llanberis, Gwynedd, Wales, UK

Mineral Species
Formula:NaCa2[Al5Si5O20] · 6H2O
Quality for species:not specified / average specimens
Validity:Believed Valid
References:Williams, D., 1924. On two olivine-dolerite dykes in Snowdonia. Proceedings of the Liverpool Geological Society, 14, 38-47.
Mineral Data:Click here to view Thomsonite-Ca data
Locality Data:Click here to view Marchlyn Mawr, Llanberis, Gwynedd, Wales, UK
Nearest other occurrences of Thomsonite-Ca
65.6km (40.8 miles) A β“˜Thurstaston Beach, Wirral, Merseyside, England, UK
216.7km (134.7 miles) B β“˜Bruslee quarry, Ballyclare, Co. Antrim, Northern Ireland, UK
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