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Ganophyllite from Franklin, New Jersey; Pajsberg, Sweden; and Wales new chemical data

Published online by Cambridge University Press:  05 July 2018

Pete J. Dunn ,
Donald R. Peacor ,
Joseph E. Nelen  and
Robert A. Ramik
Pete J. Dunn
Affiliation:
Department of Mineral Sciences, Smithsonian Institution, Washington, DC 20560, USA
Donald R. Peacor
Affiliation:
Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA
Joseph E. Nelen
Affiliation:
Department of Mineral Sciences, Smithsonian Institution, Washington, DC 20560, USA
Robert A. Ramik
Affiliation:
Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario, Canada
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Abstract

Ganophyllite from Franklin, New Jersey, Pajsberg, Sweden, and the Benallt Mine, Wales, has been chemically reinvestigated. Twelve new analyses confirm the general structure of Kato (1980) and yield the tentative formula (K,Na,Ca)2Mn8(Si,Al)12(O,OH)32(OH)4·8H2O. There is little solid solution among octahedral cations, and the Si:Al ratio is nearly constant at 10:2. Ca and (Na + K) are apparently differentiated, but all examined ganophyllites are K-rich. Much of the water content is loosely bound and the upper limit of water content is not well defined. Ganophyllite is relatively invariant in chemical composition from locality to locality.

Type
Research Article
Information
Mineralogical Magazine , Volume 47 , Issue 345 , December 1983 , pp. 563 - 566
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1983

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References

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