Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula K(Mg,Fe) 3 AlSi 3 O 10 (F,OH) 2.It is primarily a solid-solution series …

The name "biotite" is used in the field and in entry-level geology courses because these minerals generally cannot be distinguished without optical, chemical, or x-ray analysis.. Biotite is a rock …

Sep 2, 2023 · Biotite is the most common mica mineral and also known as black mica, a silicate mineral in the common mica group. Approximate chemical formula K (Mg, Fe). It can be found …

Chrom-Biotit: A Cr-bearing variety of biotite. Chromium-bearing Biotite: A Cr-bearing variety of biotite. Eastonite (of Winchell) A variety of Biotite close to Eastonite. Heterophyllite: …

Biotite is found in abundance worldwide, but collectors specimens are not common and come from few localities. Noteworthy localities include Mabubas, Bengo Province, Angola; Mendig, …

Biotite, a silicate mineral in the common mica group. It is abundant in metamorphic rocks (both regional and contact), in pegmatites, and also in granites and other intrusive igneous rocks. …

Biotite and phlogopite are among the best naturally-occurring insulating materials. Both are widely used throughout industry but small differences in their composition lead to phologite’s …

General Biotite Information : Chemical Formula: K(Mg,Fe++)3[AlSi3O10(OH,F)2 : Composition: Molecular Weight = 433.53 gm Potassium 9.02 % K 10.86 % K 2 O: Magnesium 14.02 % Mg …

Biotite refers to a group of common rock-forming minerals forming a series between phlogopite and annite. The name is best used as a field name for dark micas for which the exact …

Relief: Moderate positive Habit/Form: Euhedral crystals are not uncommon, are usually tabular parallel to (001), and have a roughly hexagonal cross section. Also found as micaceous or …