As mentioned earlier, the minerals of the mica group have a two-dimensional structure. The crystals are flaky, with extremely perfect {001} cleavage. The thin slices are flexible, have excellent splitting properties, are elastic, wear-resistant, and have good thermal stability. Therefore, mica minerals such as muscovite, synthetic mica (fluorophlogopite), sericite, and lepidolite have become good raw materials for processing and preparing pearlescent mica.