The alteration of granitic biotite to chlorite.

R. A. Eggleton, J. F. Banfield

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Abstract

Granitic biotite from SE Australia alters to a mixture of chlorite (65%), sphene (10%) and epidote (10%) through a hydrothermal (330-340oC) reaction in which two layers of biotite become one layer of chlorite. The overall reaction conserves Mg in the chlorite, and Ti + Fe + Al within the pseudomorphing chlorite-sphene-epidote assemblage. -J.A.Z.

Original languageEnglish
Pages (from-to)902-910
Number of pages9
JournalAmerican Mineralogist
Volume70
Issue number9-10
Publication statusPublished - 1985
Externally publishedYes

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