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The hydrous component of sillimanite

Beran, Anton and Rossman, George R. and Grew, Edward S. (1989) The hydrous component of sillimanite. American Mineralogist, 74 (7-8). pp. 812-817. ISSN 0003-004X.

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Polarized infrared spectra of a suite of sillimanite samples from high-grade regionally metamorphosed rocks and associated quartz veins and pegmatites (upper-amphibolite to pyroxene granulite facies), from xenoliths in basaltic rocks, and from alluvial deposits indicate that hydroxyl is the dominant hydrous species bound in sillimanite. Absorption bands at 3556, 3329, 3300, and 3248 cm^(-1) are characteristic of many of the samples. Heating experiments indicate that only above 700 °C is weight loss primarily due to loss of structurally bound OH. Complete dehydration required heating to 1400 °C. The maximum content of bound OH in the sillimanites was 0.02 wt% H_2O equivalent. The intensities of the OH features generally decrease with increasing temperatures estimated for metamorphism, consistent with the expectation that water activities decrease with increasing temperature. However, notable exceptions to this trend suggest that secondary hydration at the unit-cell scale is also a viable explanation for OH incorporation in sillimanite.

Item Type:Article
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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1989 Mineralogical Society of America. Manuscript received August 12, 1988. Manuscript accepted March 21, 1989. We acknowledge the following people and institutions for their generosity in providing samples for this study: C. Frondel, Harvard University (samples 9, 13); John S. White, Jr., U.S. National Museum (4, 7, 8, 10, 11); G. E. Harlow, American Museum of Natural History (17); J. Fabries, Museum Nationale d'Histoire Naturelle Mineralogie (19); R.I. Gait, Royal Ontario Museum (30); U. Hfllenius (6); E. R. Padovani (14); and S. Ghose, University of Washington (27). Portions of this study were funded by the National Science Foundation (U.S.A.) grants EAR-86-18200 and DPP-8613241 and the Austrian Fonds zur Förderung der wissenschaftlichen Forschung (project 3735). Financial support to A. B. by the Fulbright Commission is also acknowledged.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
Austrian Fonds zur Förderung der wissenschaftlichen Forschung3735
Fulbright CommissionUNSPECIFIED
Issue or Number:7-8
Record Number:CaltechAUTHORS:20130515-082645470
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Official Citation: Anton Beran, George R. Rossman, and Edward S. Grew The hydrous component of sillimanite American Mineralogist, August 1989, v. 74, p. 812-817
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38514
Deposited By: Ruth Sustaita
Deposited On:15 May 2013 21:52
Last Modified:26 Nov 2019 11:15

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