The Collaborative International Dictionary of English v.0.48:

Soapstone \Soap"stone`\, n.
   See Steatite, and Talc.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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]

The Collaborative International Dictionary of English v.0.48:

Talc \Talc\ (t[a^]lk), n. [F. talc; cf. Sp. & It. talco, LL.
   talcus; all fr. Ar. talq.] (Min.)
   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.
   [1913 Webster]

   Indurated talc, an impure, slaty talc, with a nearly
      compact texture, and greater hardness than common talc; --
      called also talc slate.
      [1913 Webster] Talcose

WordNet (r) 3.0 (2006):

soapstone
    n 1: a soft heavy compact variety of talc having a soapy feel;
         used to make hearths and tabletops and ornaments [syn:
         soapstone, soaprock, soap-rock, steatite]