Colorless diamond or flaky crystal, easy hygroscopy, easy soluble in water, slightly soluble in alcohol, when heated or in hot water will be decomposed, can corrode glass, toxic.

As a chemical reagent, glass carving, extraction of rare elements, and fermentaation industrial disinfectant, preservative, mordant, and silicon steel plate surface treatment, and also used to manufacture ceramic, magnesium alloy, and cleaning of boiler feed water system and steam generation system.