biotite

A dark brown to black mineral of the mica group, commonly found in igneous and metamorphic rocks.

• 🇩🇪Dunkelbraunes bis schwarzes Mineral aus der Gruppe der Glimmer, das häufig in magmatischen und metamorphen Gesteinen vorkommt.

1. Dark mica mineral C1 formal scientific

   A common dark brown to black sheet silicate mineral belonging to the mica group, typically found in igneous and metamorphic rocks.

   • Biotite is often identified by its perfect basal cleavage and dark color.
   • The granite sample contained visible flakes of biotite.
   • Geologists use biotite for radiometric dating of rocks.

   🇩🇪Dunkles Glimmermineral

• biotites plural form
• biotites' possessive plural form
• biotite's possessive singular form