Biotitic is typically used to describe a mineral or rock that is rich in biotite, a dark-colored mica mineral. Synonyms for biotitic include micaaceous, schistose, gneissic, and micaceous. Micaaceous refers to a substance that has a mica-like appearance or contains mica particles. Schistose is a term used to describe a rock or mineral that has a layered or foliated structure. Gneissic means relating to or resembling gneiss, a type of metamorphic rock with distinctive banding. Finally, micaceous pertains to something that contains or resembles mica. These synonyms can be used interchangeably with biotitic depending on the context and the specific properties being described.