granite square block

granite square block Granite Parallels Granite Angle Plate Factory DESCRIPTION Granite square block The main mineral composition of granite square block are pyroxene, plagioclase, biotite and minor olivine, magnetite trace, and the color is gloss black. Used for measuring the workpiece straightness and squareness and equipment installation. Granite square block was taken from the good quality of the underground rock layer, which experienced hundreds of millions of years of