Babingtonite, Fluorapophyllite and Sphene from Harcourt, Victoria, Australia

W. D. Birch
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.

Mineralogical Magazine; September 1983 v. 47; no. 344; p. 377-380; DOI: 10.1180/minmag.1983.047.344.14
© 1983, The Mineralogical Society
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