adjective
- containing or composed of biotite; relating to or characterized by the presence of biotite (a dark mica mineral)
Usage: geology; technical
Examples
- The biotitic granite contained large flakes of dark mica throughout its structure.
- Geologists identified the rock as biotitic schist based on its mineral composition.
- The biotitic layers in the metamorphic rock indicated high-temperature formation.
- This biotitic gneiss shows clear banding of light and dark minerals.
- The sample's biotitic content made it useful for radiometric dating studies.