Anorthoclases that had gone through structural changes due to heat treatments showed gradual reverse transformations at room temperature. These reverse transformations are attributed to slight displacements of alkali cations in the strained crystals. The present results seem to support Baskin's suggestion (1956) that the monalbite analbite transformation takes place from nuclei. The persistency of monalbite nuclei at room temperature appears to be a good measure of the original relative disorder states of the anorthoclases.

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