Natural rocks are the main raw materials of building sandstone. After crushing and screening, they can get different specifications of building products. According to their genesis, these rocks can be roughly divided into three types: magmatic rocks, sedimentary rocks and metamorphic rocks.
Magmatic rocks, also known as igneous rocks, are formed by magma ejecting from the surface or intruding into the crust for cooling and solidification. There are obvious mineral crystal particles or stomata, accounting for 65% of the total crustal volume and 95% of the total mass.
Common magmatic rocks are: granite, granite porphyry, rhyolite, orthoclase, diorite, andesite, gabbro and basalt (strength is about 250 MPa).
Sedimentary rocks, also known as hydrogenic rocks, are rocks formed by weathering products of other rocks and some volcanic eruptions through water flow or glacier transport, deposition and diagenesis in areas not too deep on the surface.
Common sedimentary rocks are limestone, dolomite, marl, tuff and shale (strength is about 60-150 MPa).
Metamorphic rocks are formed by magmatic rocks or sedimentary rocks formed first in the crust. Under the influence of environmental changes, mineral composition, chemical composition and structural structure change.
Common metamorphic rocks are gneiss, quartzite, marble, sandstone and granitic gneiss (strength is about 117.6-196 MPa).