You searched for: “trichites”
trichite (s) (noun), trichites (pl)
1. In mineralogy A, a small, dark, needle-shaped crystal: A trichite can be a kind of crystallite resembling a bunch of hairs, common in obsidian.
2.In zoology, a delicate, hairlike siliceous (containing silica) spicule (slender, sharp-pointed), found in certain sponges: A trichite is a sheaf, one of the small sheaflike fascicles (bundles) of slender setae characteristic of certain sponges.