Magnesium hydroxide, with the English name Magnesium hydroxide. Magnesium hydroxide, a white amorphous powder. Also known as caustic magnesite, light-burned magnesia, etc. The suspension of magnesium hydroxide in water is referred to as magnesium, which appears as colorless hexagonal columnar crystals or white powder, poorly soluble in water and alcohol, soluble in dilute acids and ammonium salt solutions, with its aqueous solution being weakly alkaline. Its solubility in water is very low, but the portion that dissolves is completely ionized. The concentration of a saturated aqueous solution is 1.9 mg/L (18°C). It loses water upon heating to 350°C, forming magnesium oxide. The natural mineral of magnesium hydroxide is brucite. It can be used in sugar production and the manufacture of magnesium oxide, among other applications. Because magnesium hydroxide is relatively abundant in nature and its chemical properties are similar to those of aluminum, users have begun to replace aluminum chloride with magnesium hydroxide in personal care products. It is used as an analytical reagent and also in the pharmaceutical industry.