(mi-ca´-ceous) — Consisting of, containing, or pertaining to mica; e.g. a "micaceous sediment." Resembling mica; e.g. a "micaceous mineral" capable of being easily split into thin sheets, or a "micaceous luster."
Mica is frit (glass particles that are the base component for ceramic pigments) that are not ground quite as fine as a standard frit. The particles are coated in titania. This is what gives the mica its reflective qualities. The larger particles give it the rough texture. Pigments are added to this mica base to create color variations. Micaceous colors are textural, reflective ceramic pigments.