Chemistry of potassium feldspars from three zoned pegmatites .Nov 22, 1984 . Ahstmct-An initial phase of an extensive geochemical study of pegmatites from the Black Hills, South. Dakota, indicates potassium feldspar.k feldspar pegmatite,THE DISTRIBUTION OF LEAD BETWEEN COEXISTING K .The most common value of the distribution ratio favors K-feldspar within 10 percent of a . this ratio may occur "in the very late stage of pegmatite formation.".The Formation of Chrysoberyl in Metamorphosed Pegmatites*beryl + K-feldspar + H2O = chrysoberyl + quartz + melt Mineral assemblages . these minerals are given; they indicate a post-pegmatitic metamorphic event at.
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