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Fe-Li micas: a new approach to the substitution series

Published online by Cambridge University Press:  05 July 2018

Sun Shihua  and
Yu Jie
Sun Shihua
Affiliation:
Research Center for Mineral Resources Exploration, Chinese Academy of Sciences, P.O. Box 9701, A-11 Datun Rd, Beijing 100101, China
Yu Jie
Affiliation:
Research Center for Mineral Resources Exploration, Chinese Academy of Sciences, P.O. Box 9701, A-11 Datun Rd, Beijing 100101, China
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Abstract

Over the last 50 years many definitions of element substitution series have been proposed for describing natural Fe-Li micas with complex chemical compositions. In order to compare these definitions and ascertain their reliability, a new geometric frame composed of ideal mica points, mica joins (segments), substitution vectors and substitution planes is constructed to express the entire substitution system of ideal Fe-Al-Li micas. The frame is built in composition space with the coordinate system (0; Si, AlVI AlIV, Fe2+, Li, □VI, K), but has a 3-dimensional analogue, i.e. a visual image.

Using this frame, it has been proved that there are only five possible types of replacement for definitions of Fe-Li micas, and that all possible types have been suggested except the AlIV-constant. Furthermore, it has been proved that the main point in different definitions is that the replacement of Li by Fe2+ needs to be balanced with AlIV, AlVI, or □VI. In order to solve this problem, a set of formulae determining spatial relations between geometric elements in the frame is suggested. With these formulae, the abstract frame is suggested to be a datum system used to ascertain quantitatively the reliability of definition of natural Fe-Li micas.

Keywords

Fe-Li micassubstitution seriessubstitution vectorsubstitution plane
Type
Research Article
Information
Mineralogical Magazine , Volume 63 , Issue 6 , December 1999 , pp. 933 - 945
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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