(metallurgy). To separate a metal or a mineral from an ore by various chemical or mechanical methods. (pharmacology). A pharmaceutical preparation obtained by dissolving the active constituents of a drug with a suitable menstruum, evaporating the solvent, and adjusting to prescribed standards.
Tibetans consider amethyst sacred to the Buddha and make prayer beads from it. Amethyst is considered the birthstone of February. In the Middle Ages, it was considered a symbol of royalty and used to decorate English regalia.
From Wikipedia, the free encyclopedia. For other uses, see Amethyst (disambiguation) . Amethyst is a violet variety of quartz often used in jewelry. The name comes from the Ancient Greek á¼ a- (not) and Î¼Î­Î¸ÏÏÏÎ¿Ï methystos (mÃ©thystos), intoxicated a reference to the belief that the stone protected its owner from. drunkennessmethyst is a purple variety of quartz (SiO 2) and owes its violet color to irradiation, iron impurities (in some cases in conjunction with transition element impurities), and the presence of trace elements, which result in complex crystal lattice substitutions.