| Reference Type | Journal (article/letter/editorial) |
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| Title | Low-potash gismondine from Ireland and Iceland |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | Walker, G. P. L. | Author |
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| Walker, G. P. L. | Author |
| Year | 1962 (September) | Volume | 33 |
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| Page(s) | 187-201 | Issue | 258 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_33/33-258-187.pdf+ |
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| DOI | doi:10.1180/minmag.1962.033.258.02Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 5689 | Long-form Identifier | mindat:1:5:5689:6 |
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| GUID | 0 |
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| Full Reference | Walker, G. P. L. (1962) Low-potash gismondine from Ireland and Iceland. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (258). 187-201 doi:10.1180/minmag.1962.033.258.02 |
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| Plain Text | Walker, G. P. L. (1962) Low-potash gismondine from Ireland and Iceland. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (258). 187-201 doi:10.1180/minmag.1962.033.258.02 |
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| In | (1962) Mineralogical Magazine Vol. 33 (258) Mineralogical Society |
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| Abstract/Notes | With chemical analyses by I. S. E. Carmichael.
SummaryGismondine is recorded from the Tertiary basalts of the North Atlantic region, from a total of some 40 localities in Antrim and Iceland. It occupies a well-marked position in the sequence of zeolite zones in the lavas, and the characteristic associates are chabazite, thomsonite, and phillipsite. Five new chemical analyses of gismondine from these localities show a negligible content of potash, and indicate plagioclase-type substitution, giving a series ranging from near Ca8Al16Si16O64.34H2O to near Na2·5Ca5·5Al13·5Si18·5O64.34H2O. Substitution of NaSi for CaAl leads to a decrease in refringence, birefringence, and density. |
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