👉 Hysterocrystalline is a type of crystal that has a crystalline structure with an angular defect, often known as a "hyster" or "hysterocrystal," in its lattice. These crystals have a highly ordered arrangement of atoms and molecules at the surface of their lattice planes, resulting in a high degree of order and stability. Hysterocrystalline materials are typically found in minerals such as quartz, onyx, and feldspar.