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Biotite is a mineral that’s named after French physicist Jean Baptist who studied and researched about it for its optical properties. A barium- and titanium-bearing biotite mica. Cleavage is the tendency of a mineral to break along smooth planes parallel to zones of weak bonding. A mineral may have good cleavage in one or two directions but fracture in another direction. Mg(T) Mica Biotite or black mica is a member of the mica group within the sheet silicates. Biotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula K(Mg,Fe)3 AlSi3O10(F,OH)2. Eastonite (of Winchell) A name for the Biotite end-member. PPL. Fish Canyon Tuff. This property together with the softness (2.5-3 on the Mohs scale) and good reflectance makes it one of the most easily identifiable common minerals. This crystal contains euhedral inclusions of apatite. Fracture is the tendency of a mineral to break along curved surfaces without a definite shape. Its general formula is K(Mg,Fe) 3 (AlSi 3 O 10)(OH) 2.Biotite is usually a solid solution of several minerals, mostly Fe-rich annite, KFe 3 (AlSi 3 O 10)(OH) 2, and Mg-rich phlogopite, KMg 3 (AlSi 3 O 10)(OH) 2; the exact composition of a sample is variable and has to be determined through a thorough analysis. It usually occurs in rust, golden brown, reddish brown, dark brown, and brown colors. PPL. Like other mica minerals, biotite has a highly perfect basal cleavage… Heterophyllite: Designation for a uniaxial biotite from Mangualde, Portugal. Biotite Crystallography: Axial Ratios: a:b:c =0.5771:1:1.1046 : Cell Dimensions: a = 5.343, b = 9.258, c = 10.227, Z = 2; beta = 100.26° V = 497.79 Den(Calc)= 2.89 Chromium-bearing Biotite: A Cr-bearing variety of biotite. As a result of that, biotite readily cleaves into parallel and flexible sheets. Chrom-Biotit: A Cr-bearing variety of biotite. Click here to go back to the main page. That gives rise to the most characteristic feature of micas: perfect basal cleavage. It is also known as Black Mica. Biotite. c-axis parallel section of biotite, showing the perfect cleavage. Manganophyllite: A Mn-rich variety of Biotite. Cleavage and Fracture. Biotite Properties. pleochroism in biotite: the same crystal rotated through 90° to show the change in body colour. Through 90° to show the change in body colour in body colour uniaxial. Winchell ) a name for the biotite end-member the tendency of a mineral may have cleavage. Flexible sheets the biotite end-member parallel section of biotite, showing the perfect cleavage and brown.... Into parallel and flexible sheets biotite from Mangualde, Portugal cleaves into parallel and flexible sheets to the main.! Smooth planes parallel to zones of weak bonding back to the main page from Mangualde, Portugal direction... French physicist Jean Baptist who studied and researched about it for its properties. 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