Abstract
Potassium feldspars from the granitic rocks of Chipurupalle-Razam area of Srikakulam District, Andhra Pradesh were studied by optical, chemical and X-ray diffraction methods. Most of the potassium feldspars occur both as porphy roblasts and in the groundmass in both orthopyroxene-bearing and garnetiferous granitic rocks. Potassium feldspars of the opx bearing granitic rocks are more or less homogeneous, while those of the garnetiferous granitic rocks and pink granite are mostly perthitic. The perthites are classified as stringlets, strings, rods and beads, and it is suggested that the perthite formation was due to exsolution.
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