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1952•The Journal of GeologyRequires access

The Stability Relations of Anorthite and Its Hexagonal Polymorph in the System CaAl2Si2O8-H2O

Julian R. Goldsmith, Ernest G. Ehlers

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Abstract

Hydrothermal experimentation indicates that pure anorthite is stable in the presence of H2O at temperatures down to 350° C. and possibly lower. A hexagonal polymorph of anorthite unknown in nature is consistently synthesized at low temperatures, and the possibility of its being stable below approximately 300° C. is discussed. The hydrous phases zoisite and lawsonite were not encountered.

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What this paper is about

Hydrothermal experimentation indicates that pure anorthite is stable in the presence of H2O at temperatures down to 350° C. and possibly lower. A hexagonal polymorph of anorthite unknown in nature is consistently synthesized at low temperatures, and the possibility of its being stable below approximately 300° C. is discussed. The hydrous phases zoisite and lawsonite were not encountered.

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Available abstract

Hydrothermal experimentation indicates that pure anorthite is stable in the presence of H2O at temperatures down to 350° C. and possibly lower. A hexagonal polymorph of anorthite unknown in nature is consistently synthesized at low temperatures, and the possibility of its being stable below approximately 300° C. is discussed. The hydrous phases zoisite and lawsonite were not encountered.

Key concepts: Anorthite, Hexagonal crystal system, Hydrothermal circulation, Geology, Mineralogy, Lawsonite, Crystallography, Chemistry

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