Disordered Al,Si distribution, with 0.437 Al in the T 1 site and 0.268 Al in the T 2 site. The state of maximum order for a natural (Ba,K)-feldspar with a Cn (celsian) content of 40 mol% corresponds to a disordered Al/Si distribution. Comparison with the structural data of a Ba-poor feldspar indicates that the disorder shown by such maximum ordered (Ba,K)-feldspars increases with their Cn content.--Modified journal abstract.

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