Brewsterite-Ba and harmotome from the Wicklow lead mines, Co. Wicklow, Ireland

Green, D. I.; Tindle, A. G. and Moreton, S (2005). Brewsterite-Ba and harmotome from the Wicklow lead mines, Co. Wicklow, Ireland. Irish Journal of Earth Sciences, 23 pp. 101–106.

URL: http://www.ria.ie/publications/journals/journaldb/...

Abstract

The zeolite group minerals brewsterite–Ba and harmotome occur as minor latestage primary phases in the low-temperature Pb–Zn veins at Glendalough and Glendasan, Co. Wicklow. Brewsterite–Ba was identified on a single specimen from the Old Luganure Mine. Harmotome occurs at the Glendalough Mine, the Foxrock Mine and the Old Luganure Mine. Quantitative analyses of crystals of brewsterite–Ba reveal the most barium-rich composition yet reported: (Ba1.88, Sr0.02, K0.01, Na0.01) [Al4.03Si12.02O32]·nH2O. This is close to the hypothetical barium end member. The harmotome is also barium-rich. It contains lesser amounts of sodium and potassium, but no calcium. This is the first record of brewsterite–Ba from Ireland.

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