Albite porphyroblasts consist of the core rich in inclusions and the clear rim free from them. Compositional maps of An content of albite porphyroblasts show that the albite is zoned, and the types of zoning are different between the core and clear rim. The clear rim grew around the core preferentially along the lineation. The compositional maps and the microscopic observations show that the core of the porphyroblost was originally constructed of the aggregate of minute grains. There are two types of zonal structure of albite porphyroblasts: one is the simple type in which the An content decreases from the core to the clear rim, and the other is the complex type in which the An content decreases from the center to margin within the core, but it increases in the clear rim and again decreases at the outermost part of the clear rim. The variation of An content is very small, from about 0 to 3 An per cent, and even the An-richest composition is still albite in plagioclase nomenclature. The difference of zonal structures between the complex and simple types suggests that the formational stages of the porphyroblasts were different.