If the content of fine-grained mineral is more than 90 %, it is called ultramylonite. If less than 50 %, it is called protomylonite.

• 如果岩石中细粒矿物颗粒的含量大于90%25，可称其为超糜棱岩，如果岩石中细粒矿物颗粒的含量小于50%25，可称之为初糜棱岩。