For physical and optical identification, it shares most of the characteristic properties of biotite. See the answer. Expert Answer . It may be pleochroic, but not as much as the Fe-rich biotites. Optical Properties: Phlogopite is the magnesium endmember of the biotite solid solution series, with the chemical formula KMg 3 AlSi 3 O 10 (F,OH) 2. 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. 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. The optical properties of chocolate play a vital role in consumer perception, representing type and quality in the blink of an eye. For physical and optical identification, it shares most of the characteristic properties of biotite. Phlogopite. 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. Phlogopite occurs typically as a metamorphic product (e.g., in crystalline metamorphosed limestones) and also in ultramafic igneous rocks. 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. Question: Describe How The Optical Properties Of Phlogopite Different Than Biotite. 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. Optical Properties : Phlogopite is similar to other micas in thin section. Optical properties of the phlogopite are summarized in Table 1. Phlogopite is rarely considered a valuable mineral specimen and is … Chocolate consists of cocoa butter, cocoa particles, sugar, and additives, which together determine its taste and optical properties. Cliemical Composition. The darker color and density increase with an increase in the iron content. Describe how the optical properties of phlogopite different than biotite. Phlogopite is iron poor and Biotite is iron rich. Phlogopite, like other Micas, has a layered structure which produces its perfect cleavage. Iron substitutes for magnesium in variable amounts leading to the more common biotite with higher iron content. For physical and optical identification, it shares most of the characteristic properties of biotite. This problem has been solved! 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. 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