4. The act of coating with an amalgam of tin foil and quicksilver, as
in making looking-glasses.
5. (Arch.) The enrichment of an opening by means of foils, arranged in
trefoils, quatrefoils, etc.; also, one of the ornaments. See Tracery.
6. (Geol.) The property, possessed by some crystalline rocks, of
dividing into plates or slabs, which is due to the cleavage structure
of one of the constituents, as mica or hornblende. It may sometimes
include slaty structure or cleavage, though the latter is usually
independent of any mineral constituent, and transverse to the bedding,
it having been produced by pressure.
Fo"li*a*ture (?), n. [L. foliatura foliage.] 1. Foliage; leafage.
[Obs.] Shuckford.