Granite is an igneous rock formed by the condensation of magma below the surface, and its main components are feldspar and quartz. The etymology of granite is Latin granum, which means granule or granule. Because granite is a plutonic rock, it can often form well-developed mineral particles that can be distinguished by the naked eye, hence the name. Granite is not easy to weather, beautiful in color, and its appearance can be maintained for more than 100 years. Because of its high hardness and wear resistance, it is not only used as high-grade building decoration engineering and hall floor, but also the first choice for open-air carving.
Sandstone is formed by timely particles (sand), and its structure is stable, usually light brown or red, mainly containing silicon, calcium, clay and iron oxide. Sandstone is a kind of sedimentary rock, which is mainly cemented by sand particles, and the content of sand particles is above 50%. Most sandstones are composed of quartz or feldspar.
Metamorphic rock, also known as marble. It is named after this rock which is rich in Dali County, Yunnan Province, China. It is formed by regional metamorphism or contact metamorphism of carbonate rocks. It is mainly composed of calcite and dolomite, and also contains wollastonite, talc, tremolite, diopside, plagioclase, timely and periclase. It has granular metamorphic structure and block (sometimes strip) structure. Usually white and gray marble are the majority.