Brewsterite-Ba and Harmotome from the Wicklow Lead Mines, Co. Wicklow, Ireland

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 F...

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Published in:Irish journal of earth sciences 2005-01, Vol.23, p.101-106
Main Authors: Green, D. I., Tindle, A. G., Moreton, S.
Format: Article
Language:English
Subjects:
Crystals
Earth sciences
Geology
Irish history
Lead mining
Metals mining
Minerals
Mining
Quartz
Zeolites
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Tindle, A. G.
Moreton, S.
description 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: ($Ba_{1.88},Sr_{0.02},K_{0.01},Na_{0.01}$) [$Al_{4.03}Si_{12.02}O_{32}$]-$nH_{2}O$. 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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subjects Crystals
Earth sciences
Geology
Irish history
Lead mining
Metals mining
Minerals
Mining
Quartz
Zeolites
title Brewsterite-Ba and Harmotome from the Wicklow Lead Mines, Co. Wicklow, Ireland
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