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American Mineralogist; October; v. 93; no. 10; p. 1568-1573; DOI: 10.2138/am.2008.2793
© 2008 Mineralogical Society of America
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A simple predictive model for the thermal expansion of AlSi3 feldspars

Guy L. Hovis1,*, Joanna R. Morabito1, Amy Spooner2, Andrew Mott3, Erik L. Person4, C. Michael B. Henderson5, Jacques Roux6 and Daniel Harlov7

1 Department of Geology and Environmental Geosciences, Lafayette College, Easton, Pennsylvania 18042, U.S.A.
2 O’Brien and Gere Engineers, 435 New Karner Road, Albany, New York 12205, U.S.A.
3 Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305, U.S.A.
4 Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104, U.S.A.
5 School of Earth, Atmospheric, and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, U.K.
6 Physique des Minéraux et des Magmas, IPGP, 4 Place Jussieu, 75252 Paris Cedex 05, France
7 GeoForschungsZentrum-Potsdam, Telegrafenberg, D-14473 Potsdam, Germany

Correspondence: * E-mail: hovisguy{at}lafayette.edu

We have investigated the thermal expansion of several synthetic feldspars, including Li-feldspar, rubicline (Rb-microcline), Rb-sanidine, and buddingtonite (NH4-feldspar). When analyzed in conjunction with earlier data on both ordered and disordered Na- and K-feldspars, it is clear that the coefficient of thermal expansion ({alpha}) decreases dramatically, and linearly, with increasing room-temperature volume. For "AlSi3" feldspars, then, chemical expansion limits thermal expansion. The relationship between {alpha} and room-temperature volume provides a useful predictive tool based simply on the volume of a feldspar at room temperature. This relationship also reveals that volumes of K-Na mixing in naturally occurring alkali feldspars decrease with increasing temperature.

Key Words: Thermal expansion • feldspars






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