The Kaersutites and Oxykaersutites from Alkalic Rocks of Japan and Surrounding Areas |
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| Authors: | AOKI K |
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| Institution: | Institute of Mineralogy, Petrology, and Economic Geology, Tohoku University Sendai, Japan |
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| Abstract: | Seven new analyses of kaersutites and.two of oxykaersutitesfrom Japan and surrounding areas are given, together with theiroptical properties. The type formula of kaersutite can be writtenas (Na,K)Ca2Mg3Fe2+(Ti,Fe3+)Aliv2Si6O22(OH)2 and that of oxykaersutiteas (Na,K) Ca2Mg3(Ti,Fe3+)2Aliv2Si6O24. Transformation from kaersutiteto oxykaersutite must have taken place when the ratio of Fe3+/Fe2+was about 2. |
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