The Collaborative International Dictionary of English v.0.48:

Sepiolite \Se"pi*o*lite`\, n. [Septa + -lite.] (Min.)
   Meerschaum. See Meerschaum.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Meerschaum \Meer"schaum\ (m[=e]r"sh[add]m; 277), n. [G., lit.,
   sea foam; meer sea + schaum foam; but it perh. is a
   corruption of the Tartaric name myrsen. Cf. Mere a lake,
   and Scum.]
   1. (Min.) A fine white claylike mineral, soft, and light
      enough when in dry masses to float in water. It is a
      hydrous silicate of magnesia, and is obtained chiefly in
      Asia Minor. It is manufacturd into tobacco pipes, cigar
      holders, etc. Also called sepiolite.
      [1913 Webster]

   2. A tobacco pipe made of this mineral; a meerschaum pipe.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sepiolite
    n 1: a white clayey mineral [syn: meerschaum, sepiolite]