Explanation
andesite is a neutral eject rock, and its distribution range is second only to basalt. Rock is generally gray, grayish green, light purple or purplish red, which contains a small amount of phenocryst of plagioclase, amphibole, pyroxene and biotite, and phenocryst are often in directional arrangement, because magma is cooled in the flow.
Classification
Natural materials and products -> Mineral materials