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(măgnē`zhə), two ancient cities of Lydia, W Asia Minor (now W Turkey). They were colonies of the Magnetes, a tribe of E Thessaly. One city (Magnesia ad Maeandrum), SE of Smyrna (Izmir), was later colonized by Ionians and given by Artaxerxes I to Themistocles, who died there. There are important ruins on the site, including the celebrated temple of Artemis Leucophryene, built in the 2d cent. B.C. Magnesia ad Sipylum, on the Hermus River at the foot of Mt. Sipylus, NE of Smyrna, was (190 B.C.) the scene of the defeat of Antiochus III (Antiochus the Great) by the Romans. The modern ManisaManisa
, city (1990 pop. 158,283), capital of Manisa prov., W Turkey. It is a rail junction and the market center of a rich agricultural region. Mineral deposits are nearby.
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 is nearby.


common name for the chemical compound magnesium oxide, MgO. It occurs as colorless, cubic crystals. It is refractory, melting at about 2,800°C;. It is very slightly soluble in pure water but is soluble in acids and solutions of ammonium salts. The magnesia of commerce is a fine white powder used in soaps, cosmetics, pharmaceuticals, and as a filler in rubber goods. Magnesia is used to make crucibles and other ceramic goods. Crude magnesia is prepared by roasting dolomite (calcium magnesium double carbonate) or magnesite (magnesium carbonate). Pure magnesia is prepared by refining the crude product. Magnesia is also extracted from seawater. It occurs in nature as the mineral periclase.


(inorganic chemistry)
Magnesium oxide that is processed for a particular purpose.


A fine white powder of magnesium oxide; gives brick a yellow tint.
References in periodicals archive ?
The territory around Magnesia was extremely fertile, and produced excellent wine, figs, and cucumbers.
Alireza Bagheri MD of the country's sole magnesia producer, Iranian Refractories Procurement and Production Company said that "Because of Iran's expansion program in steel production from the existing 12 million ton per annum to 35 million ton per annum in 2016, the refractory market will have dramatic growth which will cause increasing demand for DBM.
Small amounts of Phillips' Milk of Magnesia applied to the underarms with fingertips or tissue dried quickly and left no residue on clothing.
Magnesia or magnesium oxide is an alkaline earth metal oxide.
The company's magnesia and standard and fine Zirconia are used in heating appliances and steel and component production.
Spinel is obtained by thermally activated reaction above 1100[grados]C between magnesia and alumina.
The lightly burned magnesia is made from magnesium carbonate, a material for black lime, a fertilizer.
Examples of these metal oxide modifiers include: magnesia, nickel oxide, iron oxide, hafnium oxide, manganese oxide, zirconia, yttria, and rare earth metal oxides.
FEMA officials said that the grant for Bottle Village, which includes a wall built with blue Milk of Magnesia bottles, meets federal requirements for aid to repair museum objects damaged in disasters.
5, that, when Themistocles had fled into exile and been given the equivalent of political asylum by the Persian King Artaxerxes,(1) he was 'given' the three Asiatic Greek cities of Magnesia, Myus and Lampsacus.
The production of magnesia for refractories has become a two-grade industry, with a rise in demand for high performance refractories creating a growth market for higher-quality magnesia producers.
Principal battles: Thermopylae (191); Magnesia ad Sipylum (Manisa) (190).