There are three crystal forms of �±, �² and �³. Type �± is a white monoclinic crystal, �² type is a hexagonal crystal, and �³ type is a cubic crystal. Hygroscopic. Lithium sulfate monohydrate crystallized from a concentrated aqueous solution is very stable. Purpose: 1. Used as raw material for special high-strength glass; 2. Used as analytical reagents and also used in the pharmaceutical industry; 3. Flavoring agent for producing food and synthetic beverages.