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Synthesis of K2SiSi3O9 with silicon in 4- and 6-coordination

Published online by Cambridge University Press:  05 July 2018

N. Kinomura ,
S. Kume  and
M. Koizumi
N. Kinomura
Affiliation:
College of General Education and Institute of Scientific and Industrial Research, Osaka University, Toyonaka, 560, Japan
S. Kume
Affiliation:
College of General Education and Institute of Scientific and Industrial Research, Osaka University, Toyonaka, 560, Japan
M. Koizumi
Affiliation:
College of General Education and Institute of Scientific and Industrial Research, Osaka University, Toyonaka, 560, Japan
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Summary

Two kinds of vitreous material with composition K2GeSi3O9 and K2Si4O9 were treated under conditions of high temperature and pressure. The X-ray diffraction patterns of the products were similar to that of K2TiSi3O9, which has the wadeite, K2ZrSi3O9, structure.

A natural crystal of K-feldspar was also treated under the same conditions. The product was found to consist of three phases, coesite, kyanite, and the above-mentioned K2Si4O9. Since Zr ions in wadeite are in a 6-coordinated site, one-quarter of Si ions in K2Si4O9 are considered to be in 6-coordination. This is the first silicate in which Si ions occupy sites of 4- and 6-coordinations in one crystal at the same time.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 312 , December 1975 , pp. 401 - 404
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1975

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