4915 x 3484 px | 41,6 x 29,5 cm | 16,4 x 11,6 inches | 300dpi
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Occurrences Muscovite is found all over the world The largest and most important deposits of muscovite are found in the CIS Pakistan India and Brazil The United States produces only a small amount of high yield sheet mica however the United States leads the world in the production of scrap mica The major locations of scrap mica production in the United States are located in North and South Carolina Connecticut Mew Mexico Georgia and South Dakota Muscovite is characteristic of granite and granite pegmatites associated with quartz and feldspars The micas are often found in large crystal aggregates called books which can be many feet in length Micas are the major constituent of metamorphic mica schists In the metamorphic chlorite zone muscovite may be a constituent in albite chlorite muscovite schists Serecite is a form of muscovite that occurs in some schistose rocks It occurs in these rocks as a fibrous aggregate with minute scales and a silky luster Serecite can also be formed as an alteration in the walls of hydrothermal veins Good specimen material can be found in pegmatites world wide Illite is another form of muscovite that is a constituent of recent sediments soils and some shales Muscovite may also be associated with minerals such as tourmaline and beryl Uses Muscovite is a valuable mineral but it is not known for its aesthetic beauty and will never been seen as a gem Its first known use was in Old Russia as a glass This glass was termed muscovy glass Muscovite was used in this purpose due to its transparent crystals and its ability to cleave into thin sheets Sheet muscovite is used as an insulating material in electrical apparatuses due to its dielectric and heat resistant properties It was also used in this fashion as furnace doors but its use in this capacity is not as common today because of modern technology alternatives The low yield product that is in major production in the United States is used extensively in heat and electrical insulators While this
