potstone

Potstone \Pot"stone`\, n. (Min.) A variety of steatite sometimes manufactured into culinary vessels. [1913 Webster]

Steatite \Ste"a*tite\ (-t[imac]t), n. [Gr. ste`ar, ste`atos, fat, tallow: cf. F. st['e]atite.] (Min.) A massive variety of talc, of a grayish green or brown color. It forms extensive beds, and is quarried for fireplaces and for coarse utensils. Called also potstone, lard stone, and soapstone. [1913 Webster]