The Stability of Gibbsite and Boehmite at the Surface of the Earth
- 1 December 1972
- journal article
- Published by Cambridge University Press (CUP) in Clays and Clay Minerals
- Vol. 20 (6), 369-374
- https://doi.org/10.1346/ccmn.1972.0200604
Abstract
Two mutually exclusive views exist concerning the relative stabilities of gibbsite and boehmite in soils. These are examined in terms of experimental and thermodynamic evidence and it is shown that all three possible divariant assemblages of two phases that can exist between gibbsite, beohmite and H2O, may do so at 25°C and 1 atmosphere total pressure depending on the status of H2O. It is further shown that the conditions of H2O chemical potential needed to stabilize boehmite + H2O relative to gibbsite + H2O or gibbsite + boehmite, are unlikely to occur in natural waters in the zone of weathering.This publication has 4 references indexed in Scilit:
- Use of aluminum-amalgam in mineral synthesis at low temperatures and 1 atmosphere total pressureClays and Clay Minerals, 1971
- Soil Minerals in the Al2O3-SiO2-H2O System and a Theory of Their Formation*Clays and Clay Minerals, 1969
- The system NaAlSi2O6-H2O-argon: Total pressure and water pressure in metamorphismJournal of Geophysical Research, 1961
- Phase relations in the system of Al 2 O 3 -; h 2 O at high temperatures and pressuresAmerican Journal of Science, 1959