The temperatures required to homogenize lamellar feldspars from various types of rock have been determined. The results obtained indicate that the temperatures which are necessary to effect homogenization of the specimens do not in all cases represent the minimum temperature at which the feldspars crystallized. Many of the finely lamellar feldspars may have formed by simultaneous crystallization of soda feldspar and potash feldspar rather than by the exsolution of an initially homogeneous feldspar.

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