Abstract

Refinements of one ideally ordered and two partially disordered dolomites. Progressive and gradual changes as disorder increases. Completely disordered crystals could not be recovered using piston-cylinder methods owing to reordering during the quench. Disorder is complete by 1150 degrees C. Electron density maps based on intensity data from specimens which exceeded the critical disordering temperature suggest CO 3 group disorder of a rotational kind.--Modified journal abstract.

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