Abstract
On the basis of both field and laboratory studies it is well established that
polycrystalline gypsum is one of the weakest and most ductile rock materials found
in the Earth's crust (e.g. Heard & Rubey, 1966; Murrell & Ismail, 1976; Baumann,
1985; Jordan, 1988; 1991; 1994). The deformation and densification behaviour of
polycrystalline gypsum
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