Biotite
Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula K(Mg, Fe)₃AlSi₃O₁₀(F, OH)₂. Wikipedia
People also ask
Is biotite valuable?
What does biotite do spiritually?
How do you identify biotite?
Is biotite hard or soft?
People also search for
Granitic rocks. Forms a series with phlogopite. Has several polytypes (1M, 3T, 2M1). Biotite is now a group name for phlogopite, siderophyllite and eastonite.