This problem has been solved! Previous question Next question Get more help from Chegg. 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, like other Micas, has a layered structure which produces its perfect cleavage. Nearly pure phlogopite is found in hydrous ultrabasic rocks like kimberlite, and is also found in metamorphosed dolomites. For physical and optical identification, it shares most of the characteristic properties of biotite. 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. 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. Optical Properties: Iron substitutes for magnesium in variable amounts leading to the more common biotite with higher iron content. It has a smaller 2V than muscovite and is often col-ored light brown. Phlogopite occurs typically as a metamorphic product (e.g., in crystalline metamorphosed limestones) and also in ultramafic igneous rocks. Expert Answer . Question: Describe How The Optical Properties Of Phlogopite Different Than Biotite. Phlogopite is the magnesium endmember of the biotite solid solution series, with the chemical formula KMg 3 AlSi 3 O 10 (F,OH) 2. For physical and optical identification, it shares most of the characteristic properties of biotite. It may be pleochroic, but not as much as the Fe-rich biotites. 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. See the answer. Cliemical Composition. 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). 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. Phlogopite is rarely considered a valuable mineral specimen and is … Describe how the optical properties of phlogopite different than biotite. The optical properties of chocolate play a vital role in consumer perception, representing type and quality in the blink of an eye. The darker color and density increase with an increase in the iron content. 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. Biaxial 1- 2, a = 1.56, b = 1.60, g = 1.60, d = 0.04, 2V = 0° to 20°.

phlogopite optical properties

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