Widespread secondary andradite-grossular-hydrogrossular garnet, epidote, prehnite and titanite occur throughout the Galway Granite and its satellite plutons (Roundstone; Inish; Omey and Letterfrack) and even in some of the country rocks several kilometres from the granites. These minerals are not found in low CaO (<1%) granites. They formed as result of secondary fluid movements which altered the biotite, plagioclase and hornblende and also produced sericite and chlorite.

Author： Leake Bernard E.  

Publisher： Mineralogical Society

ISSN： 0026-461X

Source： Mineralogical Magazine, Vol.62, Iss.3, 1998-06, pp. : 381-386

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