Some of the highest quality ground mica is used in the cosmetics industry. Although muscovite has perfect cleavage, individual sheets are quite durable and are often found in sands that have undergone erosion and transport that would have destroyed most other minerals. While ground mica might sell for $300 per metric ton, sheet mica for specialty uses can sell for prices up to $2000 per 7 and N 1/2 sec. 182. These panes were called "muscovy glass" and that term is thought to have inspired the mineral name "muscovite.". FOREST COUNTY: Sericite is abundant in the altered volcanic rocks of the Crandon massive sulfide deposit near Little Sand Lake. equipment. domestic oil and gas drilling should sustain the demand for mica additives for drilling mud. The mica does not absorb the asphalt and stands up well to weathering. The use of ground mica is mainly determined by activity levels of the construction and auto industries. Muscovite, one of the most common forms of mica mineral. Contact one of our experts! Buchholz (1999b) reports abundant pale green muscovite locally in a pocket in a pegmatite in one of the “rotten granite” quarries south of Rib Mountain. In 2011, about 17% of the dry-ground mica consumed in the United States was used in drilling muds. R.17E. R.6W. IOWA COUNTY: Muscovite in the form of sercite is formed locally in the mineralized zone of the Demby-Weist mine, SW sec. In this formula potassium is sometimes replaced by other ions with a single positive charge such as sodium, rubidium, or This particular mineral was found in Finland. Turner, Australia. Muscovite schist: A specimen of muscovite schist. Muscovite is characteristic of granite and granite pegmatites, associated with quartz and feldspars. (Buchholz, 1997, personal communication). Courtesy of the U.S. Geological Survey Denver Library Photographic Collection. (608) 262-1705 The ability of muscovite to split into thin transparent sheets - sometimes up to several feet across - gave it an early use as window panes. and SE NE sec. 21 T.7N. in diameter occur in the complex pegmatites in sec. EAU CLAIRE COUNTY: Muscovite is found in a pink pegmatite dike near the County K Bridge over the Eau Claire River at SW NW sec. Fuchsite is often found disseminated through metamorphic rocks of the greenschist facies. It is an important rock-forming mineral present in igneous, metamorphic, and sedimentary rocks. R.12E.) The pearly luster of ground mica makes it Sheet muscovite is an excellent insulator, and that makes it suitable for manufacturing specialized parts for electrical R.8W. Publications. These crystals are called "books" because they can be split into paper-thin sheets. In pegmatites, it is often found in immense sheets that are commercially valuable. The transparent nature of muscovite is clearly seen in this photo. 20 T.22N. Ground muscovite: Photograph of ground muscovite from Mt. RUSK COUNTY: Sericite occurs in the altered volcanic rocks of the Flambeau massive sulfide deposit near Ladysmith. Image. Muscovite is found all over the world but the largest and most important deposits are found in Russia, Pakistan, India, and Brazil. Thick specimens often appear to be black, brown, or silver in color; however, when split into thin sheets muscovite is colorless, sometimes with a tint of brown, yellow, green, or rose. some automotive paints tiny flakes of mica are used to produce a pearlescent luster. 2 T.23N. Muscovite and Fuchsite. Twitter north of Willard (Myers, 1977; WGNHS outcrop descriptions). R.3E. Pinterest, Website or substitute materials is growing. — Muscovite is a common constitutent of the argillite and quartzite found in quarries and roadcuts near Power’s Bluff, NE NE sec. shearing of the finished surface; reduces water penetration and weathering, and brightens the tone of colored pigments. accessibility issues: website@wgnhs.wisc.edu, Home Muscovite is found in igneous, metamorphic, and sedimentary rocks. Muscovite is not especially resistant to chemical weathering. — Fuchsite occurs in tiny grains within the quartzite quarried southwest of Veedum in S 1/2 sec. Muscovite Crystallography: Axial Ratios: a:b:c =0.5747:1:2.2203 : Cell Dimensions: a = 5.19, b = 9.03, c = 20.05, Z = 4; beta = 95.5° V = 935.33 Den(Calc)= 2.83 About Specimen and photo by Arkenstone / www.iRocks.com. Muscovite can occur as Some of the pink muscovite is lithium enriched. Muscovite is a widespread and very common rockforming mineral. 29 T.27N. In pegmatites, it is often found in immense sheets that are commercially valuable. The auto industry in the United States uses ground mica to improve the performance of plastic parts. (Fisher, 1965). Muscovy Province in Russia yielded sheet mica for a variety of uses. (May, 1977). Specimen is approximately 3 inches (7.6 centimeters) across. 22 and 29 T.39N. The dykes are of acidic igneous origin, and the minerals probably crystallized directly from magma. It can also improve mechanical properties by increasing Madison, Wisconsin 53705 should be able to supply domestic demand, with some mica being imported for specialty use or where transportation from It can survive weatheirng, and form sparkling grains in sands and sandstone. R.7W. It occurs with biotite, pyrite and chalcopyrite, as well as molybdenite (Greenberg, 1983). R.7E and sec. Ground mica is used as a pigment extender in paint. (Myers et al., 1974). domestic producers to the consumer is more costly than imported mica. These crystals are called "books" because they can be split into paper-thin sheets. Ground mica is used as an inert filler and mold release agent in the manufacture of molded rubber products such as tires The quality of sheet mica is influenced by the presence of inclusions. (Greenberg et al., 1986) In granite pegmatites, muscovite is often found in large crystals with a pseudohexagonal outline. It also occurs in granites, in fine-grained sediments, and in some highly siliceous rocks. as sheet mica substitutes [2]. In igneous rocks, it is a primary mineral that is It is a type of mica found in many types of igneous and metamorphic rock. FLORENCE COUNTY: Muscovite (variety fuchsite) is an accessory in the altered pegmatites at the Payant-Chrissman molybdenite prospect pits in sec.
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