Experimental works on leucite using a piston-anvil device shows the following chemical reaction is favored by increasing pressure and/or decreasing temperature:
2leucitesanidine+hexagonal kalsilite

The genesis of pseudoleucite is discussed and it is concluded that the breakdown of leucite into a mixture of sanidine and hexagonal kalsilite-nepheline solid solution caused by falling temperature under a substantial partial pressure of water is one of the most important mechanisms by which pseudoleucite is formed in some igneous rocks.

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