magnesite

[mag-nuh-sahyt]
noun
a mineral, magnesium carbonate, MgCO 3 , having a characteristic conchoidal fracture and usually occurring in white masses.

Origin:
1805–15; magnes(ia) + -ite1; compare French magnésite

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World English Dictionary
magnesite (ˈmæɡnɪˌsaɪt)
 
n
a white, colourless, or lightly tinted mineral consisting of naturally occurring magnesium carbonate in hexagonal crystalline form: a source of magnesium and also used in the manufacture of refractory bricks. Formula: MgCO3
 
[C19: from magnesium + -ite1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
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magnesite

the mineral magnesium carbonate (MgCO3), a member of the calcite group of carbonate minerals that is a principal source of magnesium. The mineral has formed as an alteration product from magnesium-rich rocks or through the action of magnesium-containing solutions upon calcite. Notable deposits are those at Radenthein, Austria; the Liaotung Peninsula, Liaoning Province, China; and Clark County, Nev., U.S. Iron is usually present, and a complete chemical substitution series exists between magnesite and siderite in which iron replaces magnesium. Magnesite is used as a refractory material, a catalyst and filler in the production of synthetic rubber, and a material in the preparation of magnesium chemicals and fertilizers. For detailed physical properties, see carbonate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The carbonate that is produced, magnesite, is a commercial product one could look up.
Molded of magnesite cement, they are lighted by hidden electric bulbs.
Magnesite and other carbonates are common accessories.
Privatization efforts were continuing in the magnesite and refractories industries.
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