The Collaborative International Dictionary of English v.0.48:

Trichite \Trich"ite\, n. [Gr. ?, ?, hair.]
   [1913 Webster]
   1. (Min.) A kind of crystallite resembling a bunch of hairs,
      common in obsidian. See Illust. of Crystallite.
      [1913 Webster]

   2. (Zool.) A delicate, hairlike siliceous spicule, found in
      certain sponges.
      [1913 Webster]

   Trichite sheaf (Zool.), one of the small sheaflike
      fascicles of slender setae characteristic of certain
      sponges. See Illust. under Spicule.
      [1913 Webster]