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Babingtonite, fluorapophyllite and sphene from Harcourt, Victoria, Australia

Published online by Cambridge University Press:  05 July 2018

W. D. Birch*
Affiliation:
Department of Mineralogy and Petrology, National Museum of Victoria, 285–321 Russell Street, Melbourne, Victoria 3000, Australia

Abstract

Small crystals of babingtonite and rare sphene occur in a coarse-grained aggregate of fluorapophyllite, stilbite, and calcite, infilling a late-stage cavity in granodiorite from Harcourt, Victoria. This is the first reported occurrence of babingtonite in Victoria. The assemblage crystallized from fluids in which Ca and F were significant and under P–T conditions of the order of 0.5 kbar, 100–150°C. Some of the fluorapophyllite has been altered to opaline silica suggesting that the residual solutions were acidic.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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