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Subsilicic sodium gedrite in leptite of quartz keratophyric origin, Nordmark (Sweden)

Published online by Cambridge University Press:  05 July 2018

Kees Linthout  and
Wim J. Lustenhouwer
Kees Linthout
Affiliation:
Institute of Earth Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
Wim J. Lustenhouwer
Affiliation:
Institute of Earth Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
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Extract

The Mg—Fe orthoamphibole series □ (Mg, Fe)7Si8O22(OH)2 — Na(Mg, Fe)5- Al2Si5Al3O22(OH)2 has an open end in the sense that the Si5 end member has not been found in nature; tiny domains of near end–member composition in intricately zoned crystals (Schumacher, 1980; Robinson et al. 1982), appeared to be intergrowths of two different double-chain silicates (Schumacher, pers. comm., 1994).

Keywords

subsilicic sodium gedritequartz keratophyric protolithNordmarkSweden
Type
Short Communications
Information
Mineralogical Magazine , Volume 60 , Issue 399 , April 1996 , pp. 379 - 387
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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