Mica Density

Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula kmg,fe 3alsi 3o 10f,oh 2t is primarily a solid-solution series between the iron-endmember annite, and the magnesium-endmember phlogopite more aluminous end-members include siderophyllite and eastoniteiotite was.