mica (many kinds)

Muscovite is rhombohedral crystal-type, plate or tablet was usually foreign diamond or a square shape at six. Cylindrical horizontal stripes are obvious. Twin common, according to Mica legal contacts generated three twin or even schedule
  Muscovite is widely distributed in the rock-forming minerals, which have outputs of the three rock types. Magmatic crystallization and pegmatite advanced stage, which have generated a lot muscovite. Cloud's high temperature alteration of the British rock can also promote the formation of large Muscovite. Muscovite schist mainly in felsic rocks; In addition, they are often seen in the cloud-British rock, metamorphic schist and gneiss. Muscovite granite in the middle, often creating a larger industrial value of the crystal; pegmatite formation of the Muscovite is a multi-stage; Muscovite is widely distributed in rocks. It is in clay rocks under high temperature and potassium in the form.