| calcined magnesia | <chemical> Magnesium oxide (mgo). An inorganic compound that occurs in nature as the mineral periclase. In aqueous media combines quickly with water to form magnesium hydroxide. It is used as an antacid and mild laxative and has many nonmedicinal uses. Pharmacological action: antacids, cathartic. Chemical name: Magnesium oxide (MgO) (12 Dec 1998) |
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| gypsum | <chemical> A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety. Origin: L. Gypsum, Gr.; cf. Ar. Jibs plaster, mortar, Per. Jabsn lime. Source: Websters Dictionary (01 Mar 1998) |