Mineralogical Journal
Online ISSN : 1881-4174
Print ISSN : 0544-2540
ISSN-L : 0544-2540
Short Communications
Five manganoan zinnwaldites from Japanese pegmatites
Kazuo HARADASatoshi KANISAWAKatsutoshi TOMITA
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1990 Volume 15 Issue 2 Pages 73-80

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Abstract
Chemical and physical data for five manganoan zinnwaldites from Japan were analysed and were found to be high in fluorine, reflecting the crystallization under relatively high f (HF or F2) conditions. All specimens belong to 1M polytype. The role of fluorine on the formation of 1M type of mica structure was considered. Tetrahedral rotation angles α of five zinnwaldites were calculated from powder data.
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© 1990 Japan Association of Mineralogical Sciences
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