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American Mineralogist; October 2001; v. 86; no. 10; p. 1166-1169
© 2001 Mineralogical Society of America
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H2O-D2O exchange in lawsonite

Stefan Marion1,*, Hinrich-Wilhelm Meyer2, Michael Carpenter2 and Truls Norby1

1 Department of Chemistry, University of Oslo, Center for Materials Science, Gaustadallèen 21, N-0349 Oslo, Norway
2 Department of Earth Science, University of Cambridge, Downing Street, Cambridge CB2 3EQ, U.K.

Correspondence: * E-mail: stefanm{at}kjemi.uio.no

The mineral lawsonite, CaAl2Si2O7(OH)2·H2O, was deuterated to about 93% in a thermobalance by H2O-D2O gas-phase exchange at temperatures between 375 and 425 °C. The kinetics of this reaction are reported and diffusion coefficients for the H2O-D2O exchange are calculated from thermogravimetric measurements.




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