Abstract
The partitioning of NaAlSi3O8 between coexisting microcline and plagioclase solid-solutions is modeled using published Margules parameters for microcline-low albite solid-solutions. Variations in the structural state of the alkali feldspar may shift the temperature calculated from coexisting feldspar pairs by as much as l00°C. The magnitude of this shift varies with the compositions of the coexisting feldspar, but will generally be less than 100°C. In nature,t he effect of ordering would be less for primary orthoclase, and would not be significant if the feldspar originally equilibrated in the disordered state
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