| chalk | Synonym: calcium carbonate. Origin: L. Calx (05 Mar 2000) |
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| chalkitis | Synonym: chalcosis. Origin: G. Chalkos, copper, brass (05 Mar 2000) |
| prepared chalk | Purified native calcium carbonate, usually molded into cones; used as a mild astringent and antacid. (05 Mar 2000) |
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| French chalk | <chemical> A soft mineral of a soapy feel and a greenish, whitish, or grayish colour, usually occurring in foliated masses. It is hydrous silicate of magnesia. Steatite, or soapstone, is a compact granular variety. Indurated talc, an impure, slaty talc, with a nearly compact texture, and greater hardness than common talc. Synonym: talc slate. Origin: F. Talc; cf. Sp. & It. Talco, LL. Talcus; all fr. Ar. Talq. Source: Websters Dictionary (01 Mar 1998) |