Electron backscatter diffraction study of twins and intergrowths among quartz crystals in granite

It is shown that the Dauphiné twin is very abundant but the other twin laws (Japan, Esterel, Sardinian, Breithaupt and Cornish) are very rare for the quartz in the granite of Tiantangzhai pluton (China). Besides twin laws, many intergrowths based on overlapping faces are found, and these faces are simply the twin planes of the Japan, Esterel, Sardinian, Breithaupt and Cornish twin laws.