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Synthetic Mn-Kilchoanite—a new development in polymorphism of melilite

Published online by Cambridge University Press:  05 July 2018

Mitsuyoshi Kimata
Mitsuyoshi Kimata*
Affiliation:
Institute of Geoscience, the University of Tsukuba, Ibaraki 305, Japan
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Abstract

Two compounds with the chemical composition Ca2.32Mn0.68Si2.00O7 were synthesized from a molten carbonating silicate with the melilite composition. The synthetic samples were subsequently characterized by X-ray powder diffraction, IR absorption and EPMA, and they proved to be the anhydrous phases isomorphous with kilchoanite Ca3Si2O7 and åkermanite Ca2MgSi2O7 respectively, and to be polymorphous with each other. Their crystallochemical properties suggest that Mn-åkermanite is a high-temperature structure type of Mn-kilchoanite. Substitution of Mn2+ with an intermediate ionic radius between those of Mg2+ and Ca2+ cations establishes the polymorphic relationship between åkermanite Ca2MgSi2O7 and kilchoanite Ca3Si2O7.

Keywords

kilchoaniteåkermanitemanganese
Type
Mineralogy
Information
Mineralogical Magazine , Volume 50 , Issue 357 , September 1986 , pp. 511 - 515
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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