(6) Perilla granite

In IUGS classification, perilla granite is classified as a special rock type, generally referring to a series of intermediate-acid rocks containing hypersthene, which is closely associated with granulite metamorphic rocks in space. Only the composition equivalent to granite or perilla granite in tonalite is described here. Its appearance is similar to that of coarse-grained gneiss, and its mineral components are Yingshi, alkali feldspar, acid plagioclase, hypersthene and garnet. There are mainly microcline feldspar and striped feldspar in alkali feldspar, and striped feldspar is the most common, which is characterized by multi-feldspar instead of albite. In addition, anti-striped feldspar and middle-striped feldspar (with similar contents of potash feldspar and albite) can be found in the early Precambrian strata in Qian 'an, Hebei and Darongshan, Guangxi (photos 3- 159, 160).