Commercial granite includes the aforementioned granite, gneiss, gneiss granite, granitic schist and what the scholars call the syenite and granodiorite rocks. Rocks of gneiss include minerals, granites, and granular crystals. Commercial granite also includes other similar structures, feldspar crystallites with a small amount of by-component minerals, mainly for decorative users, such as the rock plagioclase known to rock scientists. Gneiss is a coarse crystalline rock composed mainly of silicate minerals. It is inlaid and granular crystal structure. Different types of minerals are arranged in a regular or irregular arrangement.
According to the American Society for Testing Materials Classification, granite is divided into ordinary granite and black granite. Ordinary granite is composed of quartz, feldspar, marble, etc., and has black or dark green color due to colored minerals. The whole is often influenced by the color of feldspar. The dark green or black rock of black granite is made of plagioclase, pyroxene, olivine, and hornblende. Therefore, black granite is divided into three types: porphyrite, diabase, and basalt.
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