Manganese oxide minerals from veins in the Leinster granite

Moreton, S.; Green, D. I. and Tindle, A. G. (2006). Manganese oxide minerals from veins in the Leinster granite. Irish Journal of Earth Sciences, 24 pp. 29–36.

DOI: https://doi.org/10.3318/ijes.2006.24.1.29

URL: http://www.ria.ie/cgi-bin/ria/papers/100598.pdf

Abstract

Hollandite and cryptomelane occur as intergrown botryoidal masses with goethite in a quartz vein hosted by the Leinster Granite at Cloghleagh Mine, near Blessington, Co. Wicklow. Coronadite and romanèchite accompany pyromorphite in an oxidised Pb–Zn�quartz vein at Old Luganure Mine, Glendasan, also in the Leinster Granite. Quantitative analyses show the Cloghleagh material to consist of bands of varying K:Ba ratio ranging from cryptomelane (K > Ba) to hollandite (Ba > K), but neither approaches end member composition. The Luganure material is mostly coronadite of near Pb-end member composition, in some cases mixed, or intergrown with, romanèchite.

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