- noun a soft mineral consisting of hydrated magnesium silicate, found in igneous and metamorphic rocks and used to make talcum powder
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- noun a soft mineral; a basic magnesium silicate usually occurring in foliated, granular, or fibrous masses, used in the manufacture of electrical insulators
- A mineral with a greasy or soapy feel. It is very soft, having the composition Mg3Si4O10(OH)2. See also masonry cement.
- noun clear plastic sheeting, which is used to cover maps and which may be written upon or marked