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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 ?
Samples 15 and 16 are unusual in that they both contain 2 different compositions of pumpellyite, the less magnesian of which is displayed on the diagrams.
It passes through impressive cliff top scenery and the Durham denes, deep wooded ravines carved into the Magnesian Limestone rock.
Within the Magnesian Limestone are preserved the only cluster of Ice Age cave sites in the UK.
They were treated with heavy liquids, by magnetic and paramagnetic separation, and are being studied for the presence of KIM's: pyrope garnet, picroilmenite, chrome spinel, chrome-diopside and magnesian olivine.
Stretching north from Souter lighthouse, The Leas is two and a half miles of magnesian limestone cliffs, wave-cut foreshore and coastal grassland.
North Tyneside Mayor Linda Arkley confirmed that additional investment in the planned improvements for the old magnesian limestone quarry will benefit wildlife and increase enjoyment for site users.
It occurs as the result of low temperature mineralised solutions precipitating gold, silver and sulphide minerals in porous limey, magnesian and carbonaceous sediments, which had been made porous by acid solutions emanating from nearby intrusions and fragmentation from fault activity.
The orthopyroxene is somewhat less magnesian than the coexisting clinopyroxene (Fig.
Picroilmenite grains having high chromium and magnesium contents, as well as grains of magnesian chromite, eclogitic garnet, and diopside typical of a diamondiferous mantle source, were reported in several samples collected from within map areas located between 55[degrees]N and 57[degrees]N (Fig.
Recent samples from this vicinity yielded significant kimberlitic chromite and magnesian ilmenite indicator minerals and these suggest a proximate kimberlite pipe, potentially the source of the large diamonds in the Tambaoura Plateau.
The sea led to the depositing of marl slate on top of the desert sand, with layers of magnesian limestone following, which has created the coastal scenery from Marsden to Seaham.
The coastal path, which runs for 11 miles, winds through areas of great natural, historical and geological interest with dramatic views along the coastline and out across the North Sea, an area rich in shallow bays and headlands with yellow Magnesian Limestone cliffs.