Explanation
The composition is equivalent to extrusive rock of syenite. Rock is usually light gray, light grayish yellow, grayish red, etc., with porphyritic texture, and its matrix is aphanitic or microcrystalline, with rough texture. The phenocrysts are usually transparent feldspar, crooked feldspar, sodium feldspar, and sometimes orthoclase feldspar and plagioclase. Dark minerals are mainly biotite, followed by amphibole and pyroxene. There are few minerals related to trachyte. Some copper and zinc deposits are related to hornblende porphyry.
Classification
Natural materials and products -> Mineral materials