正长花岗岩构成了九华山的主体。岩石的主要矿物有正长石、石英、黑云母等。正长石颜色为浅肉红色。此处岩石矿物颗粒的粒径0.3～5mm之间，属中细粒结构，故称中细粒正长花岗岩。 Medium-fine-grain Syenogranite Syenogranite makes up of main body of Jiuhuashan Mt.and has main minerals of orthoclase, quartz and biotite. Orthoclase’s colour is light flesh pink. The grain size of the rock minerals here is 0.3-5mm, belonging to medium-fine-grained structure and so, it is called medium-fine-grain syenogranite.