Mica sentence example

mica
  • Mica is mined near Mrogoro.
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  • The mica mined in India is practically all muscovite.
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  • In 1870 North Carolina's mica mines were reopened, and they produce the best grade of sheet mica for glazing and a large percentage of the country's yield of this mineral.
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  • Inclusions of other minerals are frequently to be observed in mica.
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  • For the more delicate species, such as the Callithamnia and Ectocarpi, it is an excellent plan to place a small fruiting fragment, carefully floated out in water, on a slip of mica of the size of an ordinary microscopical slide, and allow it to dry.
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  • Most of the island is occupied by the band of the old rocks, which include mica, glaucophane and sericite-schists and slates; there are small intrusions of granite, and numerous dikes and masses of basic eruptive rocks.
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  • The phyllites (q.v.) form a middle term between this group and the slates; they consist usually of quartz, white mica and chlorite, and have much of the foliation and schistosity of the mica-schists.
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  • Spangles of mica are much used for decorative purposes of various kinds, and the mineral was formerly known as glacies Mariae (Ger., Frauenglas) because of its use for decorating statues of the Virgin.
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  • The lapis specularis of Pliny, scattered over the Circus Maximus to produce a shining whiteness, was probably mica.
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  • Large quantities of ground mica are used in the manufacture of wall-paper, and to produce a frosted effect on toys, stage scenery, &c. Powdered mica is also used in the manufacture of paints and paper, as a lubricant, and as an absorbent of nitro-glycerine and disinfectants.
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  • The most extensive application of mica at the present day is for electrical purposes.
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  • Within these limits are to be found most of the minerals known - gold, silver, quicksilver, copper, lead, zinc, iron, manganese, wolfram, bismuth, thorium, vanadium; mica, coal, &c. On or near the coast are coal, salt, sulphur, borax, nitrates and petroleum.
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  • Quincy granite takes a very high polish, owing to the absence of mica and to the coarser cleavage of its hornblende and augite.
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  • Silver follows gold in importance, but the other minerals met with, including gypsum, mica, petroleum, natural gas, granite, marble and tin are not found in paying quantities.
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  • Slates consist largely of thin plates of mica arranged parallel to the cleavage faces.
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  • This mica has developed in the rock as it was folded and compressed.
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  • The faces of slates have usually a slightly silky lustre due to the abundance of minute scales of mica all lying parallel and reflecting light simultaneously from their pearly basal planes.
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  • In microscopic section the best slates show much colourless mica in small, thin, irregular scales.
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  • The spots contain variety of minerals, sometimes mainly white mica or chlorite.
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  • In point of absolute mass they are insignificant compared with the abundance and variety of potassiferous silicates, which occur everywhere in the earth's crust; orthoclase (potash felspar) and potash mica may be quoted as prominent examples.
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  • These crystals may be half an inch to several inches in length; they are usually more or less completely weathered to white mica and kaolin.
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  • The Concord granite is a medium bluish-grey coloured muscovitebiotite granite, with mica plates so abundant as to effect the durability of the polish of the stone; it is used for building-the outer walls of the Library of Congress at Washington, D.C., are made of this stone-to a less degree for monuments, for which the output of one quarry is used exclusively, and for paving blocks.
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  • The card or "fly," formerly made of cardboard, now consists of a disk either of mica covered with paper or of paper alone, but in all cases the card is divided into points and degrees as shown in fig.
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  • The mica card is generally mounted on a brass framework, F F, with a brass cap, C, fitted with a sapphire centre and carrying four magnetized needles, N, N, N, N, as in fig.
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  • The card is a mica disk, either painted as in fig.
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  • Just as a granite is a conglomerate or mechanical mixture of distinct crystalline grains of three perfectly definite minerals, mica, quartz, and felspar, so iron and steel in their usual slowly cooled state consist of a mixture of microscopic particles of such definite quasiminerals, diametrically unlike.
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  • The south-western part of the country, a vast and almost level plain, is known as Dar Homr. A granitic sand with abundance of mica and feldspar forms the upper stratum throughout the greater part of Kordofan; but an admixture of clay, which is observable in the north, becomes strongly marked in the south, where there are also stretches of black vegetable mould.
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  • Beneath there appears to be an unbroken surface of mica schist.
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  • The water which has found its way through the granitic sand flows over the surface of the mica schist and settles in the hollows, and by sinking wells to the solid rock a supply of water can generally be obtained.
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  • The other minerals found in the concentrates are pebbles and fragments of pyrope, zircon, cyanite, chrome-diopside, enstatite, a green pyroxene, mica, ilmenite, magnetite, chromite, hornblende, olivine, barytes, calcite and pyrites.
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  • From these rocks in the Ottawa valley are quarried or mined granite, marble, magnificent blue sodalite, felspar, talc, actinolite, mica, apatite, graphite and corundum; the latter mineral, which occurs on a larger scale here than elsewhere, is rapidly replacing emery as an abrasive.
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  • The soil of the Delta is a dark grey fine sandy soil, becoming at times almost a stiff clay by reason of the fineness of its particles, which consist almost wholly of extremely small grains of quartz with a few other minerals, and often numerous flakes of mica.
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  • The Eastern Cordillera is composed of gneiss, mica and chlorite schist and other crystalline rocks of ancient date; the Western Cordillera, on the other hand, is formed of porphyritic eruptive rocks of Mesozoic age, together with sedimentary deposits containing Cretaceous fossils.
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  • Putting aside salt, which has been already treated, the chief mining resources of India at the present day are the coal mines, the gold mines, the petroleum oil-fields, the ruby mines, manganese deposits, mica mines in Bengal, and the tin ores and jade of Burma.
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  • Mica has long been obtained in Bengal, chiefly in the Hazaribagh district, and there is a rubycoloured variety which is held in great estimation.
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  • In Madras also a mica industry has recently grown up. Tin is found in the Tavoy and Mergui districts of Lower Burma, and has for many years been worked in an unprogressive manner chiefly by Chinese labour.
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  • In other cases, Leyden jars or condensers take the form of sheets of mica or micanite or ebonite partly coated with tin foil or silver leaf on both sides; or a pile of sheets of alternate tin foil and mica may be built up, the tin foil sheets having lugs projecting out first on one side and then on the other.
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  • All the lugs on one side are connected together, and so also are all the lugs on the other side, and the two sets of tin foils separated by sheets of mica constitute the two metallic surfaces of the Leyden jar condenser.
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  • It is found in the minerals lepidolite, petalite and in various specimens of mica and of carnallite, and in some mineral waters.
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  • Iron ores are widely distributed, but have not been developed; graphite is mined in Colfax county; mica in Taos county, and to a small extent in Rio Arriba county; marble is quarried in Otero county and sandstone in Bernalillo, Colfax and San Miguel counties.
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  • The rock is a very compact and fine-grained mixture of felspar, quartz and mica, often graduating to mica schist, quartzite and gneiss.
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  • In the western and northern alpine part of Sweden, near the boundaries of Norway, the Silurian strata are covered by crystalline rocks, mica schists, quartzites, &c., of an enormous thickness, which have been brought into their present positions upon a thrust-plane.
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  • In the upper chamber, about half-way between the centre of the base and the apex, was a single skeleton, adorned with beads, copper bracelets and plates of mica; in the lower chamber, directly under the upper and partly in the natural earth, were two skeletons, one adorned with beads and the other without ornament.
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  • The primary rocks which appear at Mitushev Kamen are overlaid with thick beds of quartzites and clayslates containing sulphide of iron, with subordinate layers of talc or mica slate, and thinner beds of fossiliferous limestone, Silurian or Devonian.
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  • The Russian Altai is composed mainly of mica and chlorite schists and slates, together with beds of limestone, and in the higher horizons Devonian and Carboniferous fossils occur in many places.
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  • Mica schists form the prevalent rocks.
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  • It is only found in combination, and is a constituent of the minerals petalite, triphyline, spodumene and lepidolite or lithia mica.
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  • Quincy granite, a hornblende, pyroxene, bluish or greyish, without mica, was used for the construction of the Bunker Hill monument at Charlestown (in 1826), and of King's Chapel, Boston; and for interior decorations it has found some use, for example in the Philadelphia city buildings.
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  • Geologically, the Erzgebirge range consists mainly of gneiss, mica and phyllite.
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  • Among other manufactures are hosiery and knit goods, overalls and suspenders, hardware, lumber, oils and varnishes, gasoline fire engines, mica insulators, agricultural implements, and wagons and carriages.
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  • The gneiss is mostly grey, but occasionally pinkish, its essential constituents (felspar and quartz) being almost always associated with dark mica (biotite) and hornblende in variable quantity.
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  • Such plates are generally made of mica or selenite, and the normal to the plane of polarization of the most retarded stream is called "the axis of the plate."
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  • Below the analyser G a plate H of selenite or mica may be put in the course of the rays.
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  • Some of these are recognizable as pale yellowish and white mica; others seem to be chlorite, the remainder is perhaps kaolin, but, owing to the minute size of the flakes, they yield very indistinct reactions to polarized light.
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  • It consists of very fine scaly kaolin, larger, shining plates of white mica, grains of quartz and particles of semi-decomposed felspar, tourmaline, zircon and other minerals, which originally formed part of the granite.
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  • The felspar decomposes into kaolin and quartz; its alkalis are for the most part set free and removed in solution, but are partly retained in the white mica which is constantly found in crude china-clays.
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  • Component parts of a simple variable mica compensator for polarizing microscopes.
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  • Dating deformation using Rb-Sr in white mica; greenschist facies deformation ages from the Entrelor shear zone, Italian Alps.
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  • The fresh mica surface provides a highly hydrophilic adsorption substrate.
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  • Physical adsorption was investigated on freshly cleaved mica surfaces.
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  • Another mineral called mica is ground up to add glitter to lipsticks and nail varnish.
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  • As before stated tin will never be found far from granite, and that granite must have white mica as one of its constituents.
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  • Their effect can have dazzling and uplifting effects on a home with sparkling mica washes, sunny casein paints and sculptural bas relief work.
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  • I have recently obtained, from my contact in the Urals, a large plate of muscovite mica.
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  • Inclusions are dominated by glassy quartz, but sand and silver mica are also usually present.
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  • The darker bands, between 5mm and 10mm thick, are rich in biotite mica.
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  • The most common ferromagnesian minerals include olivine, pyroxene, amphibole and mica.
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  • After about 3 miles this gives way to crystalline schist 's, mainly mica and some very black graphite.
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  • We also found some iron pyrites associated with mica schist 's, the crystals were moderately good.
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  • A washer of thin flexible mica G concentric with the carbon button is carried by the brass disk, and projecting over the edge of this is held firmly against the rim of the cylindrical wall of the case by an annular brass collar H, which is screwed upon the outer curved surface of this wall.
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  • The acute bisectrix of the optic axes never deviates from the normal to the basal plane by more than a degree or two, hence a cleavage flake of mica will always show an optic figure in convergent light when placed on the stage of a polarizing microscope.
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  • Mica occurs as a primary and essential constituent of igneous rocks of almost all kinds; it is also a common product of alteration of many mineral silicates, both by weathering and by contactand dynamo-metamorphic processes.
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  • Sheets of mica are used as a surface for painting, especially in India; for lantern slides; for carrying photographic films; as a protective covering for pictures and historical documents; for mounting soft and collapsible natural history specimens preserved in spirit; for the vanes of anemometers; mirrors of delicate physical instruments; for various optical and many other purposes.
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  • Natural materials - He used locally-found wood, hand-rubbed metals like copper and natural elements like mica.
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  • Minerals such as zinc, iron oxides, ultramarine, titanium oxide, bismuth oxychloride and mica are all finely ground into a powder that is gently dusted onto the face with a makeup brush.
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  • Mica, the mineral that gives the mineral makeup its silky youthful glow.
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  • The Face Tint does not contain silicones or mica, both ingredients that can cause irritation to sensitive individuals.
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  • Mineral makeup often is made with zinc oxide, titanium dioxide, iron oxide and mica.
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  • These hypoallergenic cosmetics get their pigment from mica, a mineral stone.
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  • True granite is an igneous rock made up of mica, feldspar and quartz.
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  • The quartz, mica and feldspar that make up a granite countertop are ground up and mixed with a pigmented resin.
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  • The circuit board engages the heating element (made out of mica sheets and nichrome wire).
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  • Mica sheets are used as part of the toaster's heating element by providing structure for the Nichrome wire, which is wrapped around the two sheets.
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  • Mica sheets are made out of silicate minerals that can resist heat up to 1600 degrees Fahrenheit.
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  • Nichrome wire is wrapped around the two mica sheets in order to produce rapid heat.
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  • Combined with the mica sheets, the heating element can reach temperatures of up to 1100 to 1200 degrees Fahrenheit.
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  • Chinese Laundry Mica comes in black, red, royal blue and yellow.
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  • Mica powder can be added to soap for sparkle.
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  • Soap Crafters has colorants in powder, liquid, and solid forms, as well as mica.
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  • Brambleberry has colorants of all types, as well as glitter and mica.
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  • KushTush's silk pajamas is more of an off-white, which they call mica, but these are still elegant pajamas in silk charmeuse, and organic is always preferable where available.
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  • Lost Soul was formed in 1989 by Anthony (Tony) Mica and Charles (Charlie) Burke.
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  • Lost Soul was formed in 1989 by Anthony Mica and Charles Burke.
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  • Deposits of copper, tin, iron and tungsten have been discovered, and a variety of other mineral products (graphite, mica, spodumene, coal, petroleum, &c.).
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  • In emery, magnetite in a granular form is largely associated with the corundum; and in certain kinds of mica magnetite occurs as thin dendritic enclosures.
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  • In the mica-schists of this group biotite or muscovite may be the principal mineral and often both are present in varying proportions; the mica has developed from the argillaceous matter of the original rock; in addition there is always quartz and sometimes felspar (albite or oligoclase).
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  • The quartz-schists consist of quartz and white mica, and are intimately related to quartzites.
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  • Many of the freshwater algae which form a mere crust, such as Palmella cruenta, may be placed in a vessel of water, where after a time they float like a scum, the earthy matter settling down to the bottom, and may then be mounted by slipping a piece of mica under them and allowing it to dry.
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  • There is considerable difficulty in removing mounted specimens of algae from paper, and therefore a small portion preserved on mica should accompany each specimen, enclosed for safety in a small envelope fastened at one corner of the sheet of paper.
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  • Ordinary diatoms and desmids may be mounted on mica, as above described, by putting a portion in a vessel of water and exposing it to sunlight, when they rise to the surface, and may be thus removed comparatively free from dirt or impurity.
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  • The name mica is probably derived from the Latin micare, to shine, to glitter; the German word glimmer has the same meaning.
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  • The different species of mica have very nearly the same forms and interfacial angles, and they not infrequently occur intergrown together in parallel position.
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  • A similar six-rayed system of cracks, bisecting the angles between the rays of the previous set, is produced when a blunt punch is gradually pressed against a sheet of mica; this is known as the "pressure figure."
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  • These cracks coincide with planes of easy separation or of gliding in the crystal; they are especially useful in helping to determine the crystallographic orientation of a cleavage flake of mica when crystal faces are absent.
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  • Sheets of mica which have been subjected to earth-movements are frequently cracked and ridged parallel to these directions, and are then valueless for economic purposes.
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  • The plane of the optic axes may be either perpendicular or parallel to the plane of symmetry of the crystal, and according to its position two classes of mica are distinguished.
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  • The different kinds of mica vary from perfectly colourless and transparent - as in muscovite - through shades of yellow, green, red and brown to black and opaque - as in lepidomelane; the former have a pearly lustre and the latter a submetallic lustre on the cleavage surfaces.
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  • Sheets of mica very often show coloured rings and bands (Newton's rings), due to the interference of light at the surfaces of internal cleavage cracks.
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  • The composition of the several species of mica is given by the following formulae, some of which are only approximate.
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  • Roscoelite is a mica in which the aluminium is largely replaced by vanadium (V203, 30%); it occurs as brownish-green scaly aggregates, intimately associated with gold in California, Colorado and Western Australia.
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  • Artificially formed crystals of the various species of mica have been observed in furnace-slags and in silicate fusions.
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  • The best crystallized specimens of any mica are afforded by the small brilliant crystals of biotite, which encrust cavities in the limestone blocks ejected from Monte Somma, Vesuvius.
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  • These veins consist of felspar, quartz and mica, often with smaller amounts of other crystallized minerals, such as tourmaline, beryl and garnet; they are worked for mica in India, the United States (South Dakota, Colorado and Alabama), and Brazil (Goyaz, Bahia and Minas Geraes).
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  • The principal mining districts are those of Hazaribagh in Bengal and Nellore in Madras; in the former district the mica has usually a ruby tint, whilst in the latter it is more often greenish.
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  • In the Inikurti mine, Nellore, "books" of mica measuring 10 ft.
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  • On account of its transparency and its resistance to fire and sudden changes of temperature, mica has been much used for the windows of stoves and lanterns, for the peep-holes of furnaces, and the chimneys of lamps and gas-burners.
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  • For various purposes a manufactured material known as "micanite" or "micanite cloth" is much used; this consists of small sheets of mica cemented with shellac or other insulating cement on cloth or paper.
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  • Many other uses of mica might be mentioned.
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  • Mica mining is an industry of considerable importance, especially in India; but here the methods of mining are very primitive and wasteful.
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  • In working downwards in open quarries and in tortuous shafts and passages much of the mica is damaged, and a large amount of labour is expended in hauling waste material to the surface.
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  • In dressing mica the "books" are split along the cleavage into sheets of the required thickness, and the sheets trimmed into rectangles with a sharp knife, shears or guillotine, stained and damaged portions being rejected.
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  • Scrap mica is ground to powder or used in the manufacture of micanite.
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  • The price of mica varies very considerably according to the size, transparency and quality of the sheets.
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  • The slits may be cut out of tin-plate, and half covered by mica or " microscopic glass," held in position by a little cement.
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  • It was used in windows, though by no means exclusively, mica, alabaster and shells having been also employed.
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  • Green chlorite is usually also abundant in flakes like those of the mica.
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  • Garnets and mica are everywhere found.
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  • Large beds of mica are found in the east.
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