Talc n. : A soft mineral of a soapy feel and a greenish, whitish, or grayish color, usually occurring in foliated masses. It is hydrous silicate of magnesia. Steatite, or soapstone, is a compact granular variety.

Example:
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Taxonomy
Talc carbonate, mineral, rocks, metamorphic, free encyclopedia, reaction, carbon dioxide, belts, bodies, glazes, wt, tonne, talcum powder, foliated, masses, metamorphic rock, Occurrence, dolomite.

Defination from the web:
talc + water ... Talc carbonated ultramafics are typical of many areas of the Archaean cratons, notably the komatiite belts of the Yilgarn Craton in Western Australia. ...