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A new type of perthitic intergrowth has been discovered in microcline from five different localities. It was only found in those parts of the microcline which occur as relatively large untwinned monocrystalline areas. The orientation relations were measured by x-rays (Table 2). They are such that the Al/Si distribution in the AlSi 3 O 8  framework of the host and guest is “topologically coherent”. The characteristic morphological intergrowth as seen in thin sections is described. The name“plate perthite” is proposed because of the plate-like nature of the inclusions of albite, which are nearly parallel to (001) (Table 1). The mode of formation of the plate perthite is discussed.

Plate perthite, a new perthitic intergrowth in microcline single crystals, a recrystallization product