Trichite

n.
  1. (Min.) A kind of crystallite resembling a bunch of hairs, common in obsidian. See Illust. of Crystallite.
  2. (Zoöl.) A delicate, hairlike siliceous spicule, found in certain sponges.
    3. Trichite sheaf (Zoöl.),
    one of the small sheaflike fascicles of slender setæ characteristic of certain sponges. See Illust. under Spicule.