The granite, a coarse massive type, contains the following minerals: quarz, microcline, oligoclase, biotite, sphene, apatite, zircon, and magnetite with some secondary sericite, chlorite, and calcite. The minerals were isolated according to the method shown diagrammatically in Fig. 1. The relation between chemical composition and optical properties of the microcline and the biotite is elucidated. In the system of P. Niggli the granite represents a normal-granitic to yosemite-granitic magma type.