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Article: 2002 Materials Handbook. (T - Z).(ceramics company directory, product descriptions)(Directory)(Statistical Data Included)
- Article from:
- Ceramic Industry
- Article date:
- January 1, 2002
CopyrightCOPYRIGHT 2002 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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TALC. 3MgO-[4SiO.sub.2]-[H.sub.2]O. Talc is a hydrous magnesium silicate, with the composition 63.4% [SiO.sub.2], 31.9% MgO and 4.7% [H.sub.2]O when found in pure form. It is an extremely soft mineral with a Mohs hardness of 1, has a platy structure and it is naturally hydrophobic. Talc occurs as a relatively pure massive mineral in Montana, Australia and China. Elsewhere it occurs in conjunction with magnesite (Vermont, Quebec, Ontario and Finland), with tremolite and serpentine in New York and with chlorite in France and Austria. In many ceramic applications, the presence of non-talc minerals such as chlorite and tremolite are beneficial.
Talc products of ...