Properties of Synthetic Triclinic KFeSi3O8, Iron-microcline, with some Observations on the Iron-microcline{rightleftharpoons}Iron-sanidine Transition期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Properties of Synthetic Triclinic KFeSi3O8, Iron-microcline, with some Observations on the Iron-microcline{rightleftharpoons}Iron-sanidine Transition

Authors:	WONES DAVID R; APPLEMAN DANIEL E

Institution:	U.S. Geological Survey, Washington 25, D.C.

Abstract:	Triclinic KFeSi₃O₈, iron-microcline, has been synthesized fromoxide mixes and by complete conversion of monoclinic KFeSi₃O₈,iron-sanidine. Iron-microcline is triclinic, C $i$ , a=8?68?0?01?, b=13?10?0?01, c=7?34?0?01, ${alpha}$ =90? 45'?10', ß=116?03'?10', ${gamma}$ =86?14'?10'. The optical properties (Na light) are: ${alpha}$ =1?585?0?002, ß=1?596?0?002, ${gamma}$ =1?605?0?002, 2V=85?(calc.), X ${approx}$ b, Z ${wedge}$ c=20??5?. A reversible phase transition betweentriclinic and monoclinic KFeSi₃O₈ occurs at 704??6? C at 2000bars total pressure. Iron-microcline is the low-temperaturepolymorph; no intermediate polymorphs were observed in eitherhydrothermal or dry heating experiments.

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