You searched for: “trichites
trichite, trichites
1. A small, dark, needle-shaped crystal.
2. A kind of crystallite resembling a bunch of hairs, common in obsidian.
3. A delicate, hairlike siliceous (containing silica) spicule (slender, sharp-pointed), found in certain sponges.
4. Trichite sheaf, one of the small sheaflike fascicles (bundles) of slender setae characteristic of certain sponges.