The lamellar structure in moonstone and anorthoclase from Korea

Moonstone and anorthoclase from Korea were investigated using electron microscope. Lamellae of moonstone were in the range of 1,200 to 3,000 Å, and anorthoclase have fine lamellae ranging from 20 to 900 Å. The outer part of every specimen has exsolved more perfectly, and the lamellae are coarse. The inner part is in the process of exsolution, and the lamellae are extremely fine. The lamellae are parallel to (¯801), and the streations on diffraction spots are oriented normal to the lamellae.