Large pieces appear opaque until a small piece is cleaved off. Chlorite #2 thin section (hFOV 2mm) GET 360° LIVE INTERACTION. Tenacity: Thin laminae °exible and elastic, tough. Phlogopite has a few physical properties that can help you identify it. Phlogopite is also found in igneous rocks. The hydroxyl analogue of Fluorophlogopite and the magnesium analogue of Hendricksite.Also, generally the micas on the Phlogopite end (magnesium end) of the Biotite-Phlogopite Series, including Phlogopite, Fluorophlogopite, Eastonite, and Hendricksite. [1]. Color: Brownish red, dark brown, yellowish brown, green, white; colorless, pale yellow, or green in thin section. Much phlogopite is used in plastic composite body parts for automobiles. This specimen was collected from Franklin, New Jersey and measures 8.6 x 7.1 x 6.4 centimeters in size. Phlogopite Crystallography: Axial Ratios: a:b:c =0.5752:1:2.2058 : Cell Dimensions: a = 5.31, b = 9.23, c = 20.36, Z = 4; beta = 99.3° V = 984.75 Den(Calc)= 2.83 These are stiff but flexible, and they can easily be cut to shape, punched, or drilled. Usually yellowish, yellowish brown, brown, reddish brown. Twinning: Common according to Albite, Pericline, Carlsbad, … Phlogopite is an aluminosilicate mineral of potassium and magnesium, and a member of the mica group. Phlogopite is used less often than muscovite because it is less available and because its brown color is undesirable for some uses. It is also known as magnesium mica. Although phlogopite is a monoclinic mineral, the c-axis is so gently inclined that it would be easy to think that phlogopite is hexagonal. Phlogopite is a stone of the crown chakra, which means that your connection to your higher self and your true consciousness will also be enhanced. Chlorite - (Mg,Fe 2+,Fe 3+,Mn,Al) 12 [(Si,Al) 8 O 20](OH) 16 Chlorite is the group name for about 10 related minerals. Barrel-Shaped Phlogopite Crystal and small phlogopite flakes in white marble. Sheet mica is used in the electronics industry to make stiff, heat-resistant, non-conducting boards for electronic components. Phlogopite and muscovite are the only two mica minerals that are used commercially. - Indicates mineral may be doubtful … Crystal Data: Triclinic. Transparent to translucent in small pieces. - This locality has estimated coordinates. However, the term chlorite can be used both … Biotite, another common mica, is recognized by the IMA as a mineral group of related micas rather then as an … Phlogopite is most commonly found in metamorphic rocks. The first is a yellow to brown to reddish brown color. Next, as a mica, phlogopite easily splits into thin sheets that are transparent, flexible, and tough. © Copyright 1997 - 2020 Hershel Friedman and Minerals.net, all rights reserved. Cleavable, granular, or massive. Phlogopite has many properties that make it valuable in manufacturing. The result is typically one of the following: scattered flakes and small crystals of phlogopite throughout the rock; concentrations of phlogopite in parts of the limestone where clay was abundant; or, concentrations of phlogopite in metamorphosed shale along the margins of the limestone. Point Group: 1: Crystals typically thin, tabular along [010], and rhombic in section, to 4 cm. Mica Group. Phlogopite is also found in high-alumina basalts. = 2.79 Optical Properties: Transparent to translucent. Phlogopite schist can form through this same process. In this work, macrocrysts are distinguished from microcrysts and groundmass grains based on the exposed surface area in thin section: macrocrysts have a surface area > 50 × 10 3 μm 2 … Physical Properties of Phlogopite. Its interference colors commonly seem anomalously bright compared to pyroxenes, possibly a result of the high dispersion … Cleavage steps can be seen on the top of the crystal. Sheet mica boards can be cut, punched, stamped, and machined to close tolerances. Formula: (Mg,Fe) 3 (Si,Al) 4 O 10 (OH) 2 • (Mg,Fe) 3 (OH) 6. Streak: White. Phlogopite and muscovite are the only two mica minerals that are used commercially. X 7.1 x 6.4 centimeters in size a few physical properties that make it in. Elastic, tough brown to reddish brown and measures 8.6 x 7.1 x 6.4 in! 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