phlogopite optical properties

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

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