Garronite, a New Zeolite, from Ireland and Iceland

G. P. L. Walker
With chemical analyses by I. S. E. Carmichael, M.A. Imperial College, London S.W. 7.

Summary: A new zeolite closely related to phillipsite and gismondine is recorded from thirty localities in the Tertiary basalts of Antrim and eastern Iceland, and the name garronite is proposed. Four chemical analyses indicate a composition of NaCa2·5A16Si10O32.13·5H2O. Garronite differs chemically from phillipsite in having a very low content of potash, and from gismondine in containing less lime, alumina, and water; optically garronite is intermediate between these two zeolites.

Mineralogical Magazine; September 1962 v. 33; no. 258; p. 173-186; DOI: 10.1180/minmag.1962.033.258.01
© 1962, The Mineralogical Society
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