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It is also known as magnesium mica.Phlogopite is the magnesium endmember of the biotite solid solution series, with the chemical formula KMg 3 (AlSi 3 O 10)(OH,F) 2. The optical properties of chocolate play a vital role in consumer perception, representing type and quality in the blink of an eye. Phlogopite is the magnesium endmember of the biotite solid solution series, with the chemical formula KMg 3 AlSi 3 O 10 (F,OH) 2.Iron substitutes for magnesium in variable amounts leading to the more common biotite with higher iron content. Expert Answer . Nearly pure phlogopite is found in hydrous ultrabasic rocks like kimberlite, and is also found in metamorphosed dolomites. Phlogopite is the magnesium endmember of the biotite solid solution series, with the chemical formula KMg 3 AlSi 3 O 10 (F,OH) 2. This problem has been solved! Describe how the optical properties of phlogopite different than biotite. Biotite, with more Fe-rich compositions is common in dacitic, rhyolitic, and trachytic volcanic rocks, granitic plutonic rocks, and a wide variety of metamorphic rocks. It may be pleochroic, but not as much as the Fe-rich biotites. The darker color and density increase with an increase in the iron content. See the answer. Chemical Formula: KMg 3 (AlSi 3 O 10)(OH,F) 2 Name Origin: From the Greek flogopos – “resembling fire.”Phlogopite is a yellow, greenish, or reddish-brown member of the mica family of phyllosilicates. Question: Describe How The Optical Properties Of Phlogopite Different Than Biotite. For physical and optical identification, it shares most of the characteristic properties of biotite. Phlogopite. Chocolate consists of cocoa butter, cocoa particles, sugar, and additives, which together determine its taste and optical properties. For physical and optical identification, it shares most of the characteristic properties of biotite. Phlogopite is iron poor and Biotite is iron rich. K(Mg,Fe) 3 AlSi 3 O 10 (OH) 2 Phlogopite refers to micas at the magnesian end (Mg/(Mg+Fe) > 0.67) of the biotite-phlogopite solid solution series.Phlogopite has many of the optical characteristics of biotite, with the most important difference being that phlogopites are less strongly coloured (i.e., the pleochroic colours are not as intense). Optical Properties : Phlogopite is similar to other micas in thin section. Cliemical Composition. Phlogopite, like other Micas, has a layered structure which produces its perfect cleavage. It has a smaller 2V than muscovite and is often col-ored light brown. Biaxial 1- 2, a = 1.56, b = 1.60, g = 1.60, d = 0.04, 2V = 0° to 20°. Previous question Next question Get more help from Chegg. Phlogopite is rarely considered a valuable mineral specimen and is … For physical and optical identification, it shares most of the characteristic properties of biotite. Optical properties of the phlogopite are summarized in Table 1. Optical Properties: Phlogopite occurs typically as a metamorphic product (e.g., in crystalline metamorphosed limestones) and also in ultramafic igneous rocks. Iron substitutes for magnesium in variable amounts leading to the more common biotite with higher iron content. Main members – phlogopite (KMg 3 (AlSi 3 O 10) (OH) 2) as Mg end-member, annite (K Fe 3 2 + (AlSi 3 O 10) (OH) 2) as Fe end-member. Color and density increase with an increase in the iron content, and often... In crystalline metamorphosed limestones ) and also in ultramafic igneous rocks the more biotite..., has a smaller 2V than muscovite and is muscovite and is optical properties of biotite the blink an... Not as much as the Fe-rich biotites 2V than muscovite and is often col-ored light brown characteristic! Color and density increase with an increase in the iron content but as. 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