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Article: Materials handbook.(DOLOMITE-SEALS)
- Article from:
- Ceramic Industry
- Article date:
- January 1, 2008
CopyrightCOPYRIGHT 2008 BNP Media. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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DOLOMITE. CaMg[(C[O.sub.3]).sub.2]. Sp. gr. 2.9; hardness Mohs 3.5-4.0. A rock intermediate in composition between limestone (CaC[O.sub.3]) and magnesite (MgC[O.sub.3]). True dolomite is composed of 54% CaC[O.sub.3] and 46% MgC[O.sub.3]. Other materials containing appreciable amounts of magnesium carbonate, but less than the 46% found in true dolomite, are commonly called dolomitic limestones, and also are used in the ceramic industry.
In the raw state, dolomite may be white, light buff, pink, yellow to brown and gray to blue. Its physical structure may be either crystalline or amorphous. Fired material is white. At about 1650[degrees]F, all C[O.sub.2] is ...