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.




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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