biotite

About 0.77 uses per million words.

Meaning

1. noun A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.

Similar words

granodiorite tonalite gneiss hornfels pleochroic calciobiotite brookite hydrobiotite bikitaite bokite

Often followed by

and is granite gneiss in schist are or flakes

Word family

biotites biotitic