Thixotropic
Thixotropy is a property of certain gels which liquefy when subjected to vibratory, sideways forces like shaking, but solidify again when left standing. This is a common behavior for colloids. An everyday example would be toothpaste.
The thixotropic nature of some clays can be a factor in earthquake damage. Clayey ground can practically liquify under the shaking of a tremblor, greatly increasing the effect on buildings.
The opposite property, in which shaking causes solidification, is called dilatant. It is much less common.
Thixotropic additives are important paint additives, allowing a smooth flowing application that doesn't run.
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