According to the types of minerals, it can be divided into black granite, muscovite granite, hornblende granite and phlogopite granite. The dark green granite can be divided into fine-grained granite, medium-grained granite, coarse-grained granite and porphyritic granite. Plaque-like granite, crystal granite and gneiss granite According to the sub-minerals, it can be divided into cassiterite-rich granite, strontium-bearing iron ore, strontium-bearing granite, lithium mica granite, tourmaline granite and so on. Common long-Petrochemical, Yunying lithification, electrical and petrochemical and other self-metamorphism. Granite is a widely distributed rock that is produced in all geological times. Most of the forms are rock foundations, rock strains, rock bells, and the like. Thin Ball Valve,Floating Ball Valve,Pvc Ball Valve,Wafer Type Thin Ball Valve Wenzhou KAIZHENG Valve Technology Co.,LTD. , https://www.kazevvalve.com