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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 ?
2+] suggests that the precipitation of magnesian calcite, hydromagnesite, nesquehonite, or sepiolite is almost negligible in the soils under study.
1978) The crystal chemistry and petrogenesis of a magnesian rhodonite.
PGE Analyses: Patrick Highsmith, chief geochemist for ALS Chemex in Vancouver, recently indicated that the first step to obtain precise and accurate geochemical results is alerting the geochemical laboratory when samples are submitted that may contain things like highly magnesian minerals, or elevated amounts of chromite, sulphides, magnetite, or iron-platinum alloys.
2) was in the sequence: kieserite granules (1-3 mm) [is greater than] calcined magnesite powder ([is less than] 1 mm) [is greater than] calcined magnesite granules (1-3 mm) [is greater than] magnesian limestone (65% [is less than] 1.
the sea current of up to two knots which Admiralty Chart 1556 shows, or used to show,(11) running south along the Magnesian coast and turning into the straits of Trikeri.
3), when Hegesias the Magnesian makes a an obtuse comment regarding the coincidence of Alexander's birth and the fire at the temple of Ephesian Artemis.
Since the ore was found near the Asia Minor city of Magnesia, it came to be called the Magnesian stone, or in English, a magnet, and the phenomenon was magnetism.
Whereas the continental massifs are old (billions of years, on average), thick, and composed of silica-rich rocks such as granites and andesite, the oceanic crust is young, thin, and composed of silica-poor magnesian lavas such as basalt.
They are being treated with heavy liquids, by magnetic and paramagnetic separation, and will be studied for the presence of KIM's: pyrope garnet, picroilmenite, chrome spinel, chrome-diopside and magnesian olivine.
The trust has taken on the internationally important magnesian grassland at Herrington Hill from a private owner after raising the money from the Banister Charitable Trust and an anonymous donation.
Marsden Old Quarry, which has wildflower-rich magnesian limestone grassland, will also be used to create a new meadow under the Coronation Meadows Project which seeks to create at least one new meadow in every county in Britain.
Delivery of magnesian carbonate and application to aircraft (helicopter o.