Let us know if you have suggestions to improve this article (requires login).   Limestone The general formula for the mica minerals is XY 2-3 [(Si,Al) 4 O 10](OH,F) 2, where X = K,Na,Ca and Y = Mg,Fe,Li,Al. Mica has low head conductivity coupled with great dielectric strength. It is characteristic of peraluminous rock, in which the content of aluminum is relatively high. Robert J L, Gasperin M (1985) Crystal structure refinement of hendricksite, a Zn- and Mn-rich trioctahedral potassium mica: a contribution to the crystal chemistry of zinc-bearing minerals Tschermaks Mineralogische und Petrographische Mitteilungen 34 1-14: 1985: Franklin Furnace, New Jersey, USA: 0: 293: 0002348: Kinoshitalite In fact the name mica is believed to have characteristic are the thin crystal layers. The names of the rock-forming micas constitute a good example of the diverse bases used in naming minerals: Biotite was named for a person—Jean-Baptiste Biot, a 19th-century French physicist who studied the optical properties of micas; muscovite was named, albeit indirectly, for a place—it was originally called “Muscovy glass” because it came from the Muscovy province of Russia; glauconite, although typically green, was named for the Greek word for blue; lepidolite, from the Greek word meaning “scale,” was based on the appearance of the mineral’s cleavage plates; phlogopite, from the Greek word for firelike, was chosen because of the reddish glow (colour and lustre) of some specimens; paragonite, from the Greek “to mislead,” was so named because it was originally mistaken for another mineral, talc. Updates? For the record, Deer Howie and Zussman give the formula as K(Al,Fe3+)Al1–x(Mg,Fe2+)x[Al1–xSi3+xO10](OH)2. granites, diorites, gabbros and peridotites. Mica is heat-resistant and does not conduct electricity. For chemical formula and detailed physical properties, see mica (table). It is a fundamental component of many metamorphic shingers and forms in suitable compositions in a wide range of pressure and temperature. and hydrothermal vents. Muscovite, KAl2Si3AlO10(OH,F)2, is a high-aluminum mica common in felsic rocks and in metamorphic rocks of the pelitic series, derived from clay. The minutely crystalline variety consisting of muscovite or paragonite (or both), generally referred to as sericite, is silky. come from the Latin word micare which means “to shine.” Mica is Thus, the cross-linked double layer is bound firmly, has the bases of silica tetrahedrons on both of its outer sides, and has a negative charge. The charge is balanced by singly charged large cations—for example, potassium in muscovite—that join the cross-linked double layers to form the complete structure. The Mica family of minerals includes It is sometimes found in large degradable crystals in pegmatite veins, as is sometimes the case in New England, Virginia and North Carolina USA. All of these micas except glauconite exhibit easily observable perfect cleavage into flexible sheets. Biotite is commonly used to limit the age of rocks through potassium-argon escort or argon-argon escort. London: DK Publishing. The term "sericitic alteration" refers to this kind of metamorphism. The visual quality classification of Muscovite mica is broadbased. Outstanding Muscovite crystals, some bright yellow and others with perfect star formations, come from the famous pegmatite localites in the Doce and Jequitinhonha Valleys in Minas Gerais Brazil. IF SO, YOU MAY WANT TO CHECK OUT OUR OTHER SITES. While Muscovite is a hydrous potassium aluminium silicate, Phlogopite is a hydrous magnesium aluminum silicate, commonly known as Amber mics.

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