The Collaborative International Dictionary of English v.0.48:

Stinkstone \Stink"stone`\, n. (Min.)
   One of the varieties of calcite, barite, and feldspar, which
   emit a fetid odor on being struck; -- called also
   swinestone.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Anthraconite \An*thrac"o*nite\, n. [See Anthracite.] (Min.)
   A coal-black marble, usually emitting a fetid smell when
   rubbed; -- called also stinkstone and swinestone.
   [1913 Webster]