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Mineralogical Magazine; December 1999; v. 63; no. 6; p. 933-945
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Fe-Li micas; a new approach to the substitution series

Sun Shihua, and Yu Jie

Chinese Academy of Sciences, Research Center for Mineral Resources Exploration, Beijing, China

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, Al VI , Al IV , Fe (super 2+) , 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 Al IV -constant. Furthermore, it has been proved that the main point in different definitions is that the replacement of Li by Fe (super 2+) needs to be balanced with Al IV , Al VI , 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.

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