How to use calcite in a sentence

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Sentence Examples Along with subsequent calcite deposition, the pentameres are obliterated, the outline becomes rounded, and nodose sides appear. Most specimens are on a typical brown goethite matrix and may have associated calcite, plattnerite, barite, fluorite, and hemimorphite. The trick to recovering fine specimens is to collect the chunks of rock showing prehnite and calcite. Around one corner, the mine became snow white with calcite and sodium chloride. This cavity may then be filled with coal, calcite, siderite, or any other form of sediment. Phosphate may also replace calcite or be precipitated instead of calcite in neutral or slightly acidic pH conditions. Further up the core into the Waulsortian sequence, the limestones are cleaner and the breccia clasts are cemented by calcite. Other than clay minerals, calcite and pyrite are the most common secondary minerals present. The calcite and other such minerals suffered greatly from exposure to the weather. Abundant thin calcite and quartz veins cut the schists, and have been boudinaged and rotated parallel to the first cleavage. The major mineral constituents of coal balls are calcite, dolomite, ferroan dolomite and pyrite. Analcime may also be associated with quartz crystals, calcite, and common opal. In some geodes, the brown calcite is completely hidden by clear calcite secondary growth. Matrix minerals of the septaria are ferroan dolomite, quartz, calcite, and pyrite. The main gangue minerals that make up the vein are massive white calcite, quartz, and prehnite. Strontium concentrations in seawater reflect the diagenesis of Sr-rich aragonite to calcite on continental shelves. The sparry calcite is interpreted as a single phase of precipitation that infilled external moulds of the arthropod. The walls of the cave were clean white limestone and decorated with pretty cave flowers and calcite crystals. No particularly strong fluorescence of calcite, especially by comparison with glass, has been noticed. Experimental data ranges for both quartz and calcite rocks are indicated along the stress axis. Show More Sentences One factor that may control early calcite precipitation in sand injections is pressure drops that occurred shortly after fluidization ceased. Galena is also found as larger isolated octahedral crystals within the coarse calcite cement in breccias in the upper parts of the core. Several pockets up to 1.3 meters and containing calcite crystals were exposed in the walls of the stopes. Commonly associated minerals include orpiment, stibnite, a variety of sulfides and sulfosalts, calcite, and barite. The siltstones are composed of angular quartz and rare feldspar, set in a finer matrix that locally contains some calcite. Vein minerals are barite, calcite, chalcopyrite, kaolinite, pyrite, sphalerite, and wurtzite. Small pods of calcite, on the other hand, occur mainly in the outer portions of the intermediate zone. Even the arsenic mine at Shimen, Hunan Province, is still the source of minor amounts of good realgar, orpiment, and calcite. The calcite is an insoluble mineral, which upon death of the organisms sinks to the floor of the body of water and accumulates in the sediment. Where the deposition of calcite is concentrated along cracks, calcite is deposited as flowstone, or dripstone. The main minerals identified were mainly calcite also some diopside, wollastonite, iron oxides and a few scattered dolomite crystals. The barite and calcite form excellent euhedral crystals in concretions within the Cretaceous-age Mancos Shale. Additional weak silicic solutions formed thin encrustations of quartz on the calcite in delicate encrustation pseudomorphs. Striking specimens of red cuprite-included calcite and dolomite were once commonly available. The mix we use contains compost, peat, perlite, rock phosphates, blood meal, calcite clay and gypsum. The calcite produces white streaks in the lapis and too much calcite will lower the value of the stone. The junction pockets are commonly lined with quartz and calcite upon which zeolites and associated minerals crystallize. A comparison between all the techniques used to analyse calcite cements reveals subtle differences between injected and depositional sandstones. Multiple phases of zoned calcite are common, often truncated by a major dissolution surface overgrown by a late, granular calcite. Many choice specimens of sphalerite, calcite, galena, and dolomite could be collected from pillars and small areas not previously mined. Show More Sentences The concretion matrix is dominantly an interlocking mosaic of calcite, ferroan dolomite and quartz. It is dominated by the deposition of calcite with minor pyrite, marcasite, barite, anhydrite and gypsum. The large, transparent crystals known as Iceland spar, however, are pure calcite. Spiroff reports cleavable masses of black calcite, with the color probably due to inclusions of chalcocite or tenorite. Many of these calcite crystals and crystal groups are partially or completely covered with an overgrowth of pyrite. The indistinct boundaries between these dolomite rhombs and the calcite suggests that the latter has been partially dolomitized. Barite, dolomite, and quartz crystals were scattered on the surfaces of the calcite. Vein minerals are aragonite, barite, calcite, dolomite, quartz, sphalerite, and whewellite. He arrived at this from a study of calcite crystals of various habits and noted that the cleavage rhombohedra were always the same. Both samples consist of fine-grained calcite with elongated or equant shapes. Along this seam were occasional pockets from 0.1 to 0.5 meter across, lined with calcite rhombohedra. This occurrence is known for plates of complex rhombohedra of pink manganoan calcite. At most locations in the Deccan Traps, the primary form for calcite is the rhombohedron. The calcite formed scalenohedral and rhombohedral crystals on some of the quartz crystal groups. The nonzeolites apophyllite, calcite, and quartz commonly occur at many localities. This calcite typically overgrows quartz and crystallizes before heulandite, stilbite, and apophyllite. Good specimens of sperrylite with apophyllite, prehnite, thaumasite, and calcite are reported. The limestone is highly fractured and contains abundant calcite and quartz veins. In the crystallization sequence from hydrothermal solutions, calcite is typically a late and low-temperature crystallizing mineral. Most of the arthropods consist of an infill of sparry calcite with uniform luminescence. Show More Sentences Most such specimens are partially coated with a druse of calcite, epidote, and small, clear needle quartz crystals. These crystals are associated with chalcopyrite, galena, quartz, calcite, epidote, and chlorite. The magnetite, uralite, and other minerals can be exposed by etching away the enclosing calcite with hydrochloric acid. The purest examples of calcite, however, are transparent, with perfect crystal form and clarity. The greenish-colored vein averages 2-4 feet in width and is composed of epidote, quartz, and calcite. In the largest pockets, pale blue barite crystals formed coatings to 1 cm thick on the calcite crystals. Invisible traces of quartz, calcite, gypsum and feldspar, the dust of its resting place for more than two millennia, cling to the bronze. In each of these settings, progressive evaporation of seawater leads to precipitation of calcite and gypsum followed by halite. Limited dolomitization of the calcite around the edges of the fossils and in the matrix of the concretion occurred at a later stage. In one specimen stephanite was intimately associated with pyrite in a matrix of tabular calcite crystals, all on quartz. It is found in association with cerussite, calcite, hemimorphite, aurichalcite, malachite, willemite, and chrysocolla. In all specimens the groundmass is peppered with opaque minerals, rare apatite laths and rare euhedral blade-like calcite. All of the crystallized copper was enclosed in calcite, which was etched away with a sulfamic acid solution. Microcrystals of pyrrhotite, goethite, pyrite, galena, and calcite are found on the dumps. In September 2002 Carlson sent samples of this material to Dan Behnke, who etched them with sulfamic acid to remove the calcite. The mordenite is associated with a hemispherical form of pale yellow calcite and cubic pyrite. Iron oxide nodules are commonly septaria, exhibiting networks of thin veins of coarsely granular calcite. Matrix minerals of the dolostone septaria are ferroan dolomite, quartz, calcite, and pyrite. Polygonal septarian cracks are filled with sparry calcite cements or micrite matrix. At the latest, low-temperature stage, calcite develops steep scalenohedra and overgrows stilbite or apophyllite. Show More Sentences Some of the material contained micaceous masses of specular hematite associated with quartz, epidote, and numerous veinlets of calcite. Vein minerals are barite, calcite, chalcopyrite, galena, pyrite, and sphalerite. The free carbonate fraction is dominated by calcite that probably precipitated during early diagenesis, in contact with diagenetic pore water. The way on is a traverse round a mud bank to the left, which climbs into a passage above the calcite floor. Cuprite occurred along with chalcocite as inclusions in small calcite crystals. The fine-grained sediment of the matrix is composed chiefly of siderite, with lesser amounts of illite, calcite, quartz, and bitumen. Continuing on your tour you see a 70-cm-high giant twin calcite crystal from Siberia that gives off an amber glow in sunlight. There is much evidence for zoning in these calcite crystals and also some evidence for breaks in deposition and even temporary dissolution. These differential stress conditions are further supported by the small size of both recrystallized and twinned calcite grains. The shoots and stalks themselves are casts composed of combinations of chalcedony, quartz, calcite, and barite. Vug-filling minerals are barite, calcite, celestine, dolomite, sphalerite, and strontianite. These molds are now lined with crystals of celestine, fluorite, pyrite, strontianite, dolomite, calcite, sphalerite, and barite. Deformation bands and early calcite cement develop upon wall-rock contraction after fluidization ceased and fluid pressures dropped. The c-maximum fabric normal to foliation is typical of calcite rocks deformed experimentally to high strains in simple shear. Two adjacent geodes from the same piece of shale could be cracked open, and one would be lined with brown calcite, the other with quartz. Associated minerals were calcite, copper, cuprite, tenorite, and malachite. Pseudomorphs of smithsonite after calcite crystals have been reported from this locality. The essential proportion is given by three hectograms of calcite for one kilo of earth. The blobs correspond to vacuities in the dentine and are probably due to calcite or some other post-mortem infilling. The Nicol prism is made up from two prisms of calcite cemented with Canada balsam. Show More Sentences The Nicol prism, which is made entirely of calcite, a doubly refracting mineral, isolates one beam cleanly. Quartz is the dominant mineral in veins in siliceous rocks, calcite in limestones, and gypsum in gypsiferous sediments. The calcite acts as a mask, obscuring the gold-bearing veins from the predominate ones that contain nothing. The skarns also contain hornblende, calcite, pyroxene, tremolite, pyrrhotite, molybdenite, galena, chalcopyrite, arsenopyrite, garnet, and pyrite. Brookite is best known from alpine-cleft-type occurrences, where it is round with anatase, rutile, titanite, quartz, adularia, albite, hematite, calcite, and chlorite. Her bones stick up from the ground, and water has sealed them with a sparkling calcite coating. In seasonally wet tropical areas, tower karst hills are often residuals from past wetter climates and tend to have their caves partially filled by secondary calcite deposits. As seen in the granite, subhedral to anhedral grains of fayalite are fractured and show varying stages of alteration to hematite, antigorite, calcite, and magnetite. In places pyrite framboids and polyhedra occur associated with the ferroan dolomite rhombs, the latter aligned as they would have been within the original calcite. Access to the pit is prohibited, but excellent specimens of calcite scalenohedra, dolomite rhombohedra, pyrite, and marcasite have been collected from the pit's east wall. Specimens of slightly twisted, slightly curving chains of malformed, obtuse rhombohedra of calcite have been collected as specimens from the Cross vein. The surface luster of many of the calcite crystals is frosted. Along the contact zone the limestones were recrystallized into a cloudy white, massive calcite containing grossular, epidote, magnetite, quartz, and tremolite. Another example of microstructural control is that aragonite with complex microstructures can dissolve more rapidly than thermodynamically less stable magnesian calcite. The crystallization of barite followed the calcite and quartz. White to yellowish calcite often fills the central part of the agate and must be dissolved away to expose the quartz, which is common, and the barite, which is less common. Here we have used the atomic force microscope to directly observe changes in the atomic lattice on a calcite seed crystal after the introduction of abalone shell proteins. In the vein's central vug, ferroaxinite overlies a selvage of quartz, orthoclase, and microcline feldspar and is followed by fine-grained calcite. After the coarse calcite was replaced by fluorite, the titaniferous magnetite rims remain as partly martitized magnetite rims around the fluorite ore pods. Petrographic study reveals clusters of small grapestone particles, including benthic foraminifera, spines and calcite crystals encrusted by micrite. Show More Sentences Although the quartz encrustation protects the calcite from dissolving, it obscures the twinned nature of the crystals, which is revealed by mechanical removal of the crust. These mylonites are microstructurally more homogeneous than other types, and consist of very finegrained calcite that displays an elongate grain shape fabric. Throughout the Timirovo thrust system, coarse-grained fragments of calcite veins form elongate boudins predominantly oriented parallel to the mylonitic foliation. On a dark night during the fall I was examining the uvarovite and I discovered that there was a crack in the calcite on the side of the uvarovite. The veins are surrounded by a 5-to 10-cm-wide alteration zone that consists of calcite, dolomite, diopside, hedenbergite, vesuvianite, and base-metal sulfides. Specimens of this unusual calcite are on display at the Mineral Museum. The early diagenetic precipitation of hematite and calcite took place during subaerial exposure and are the results of caliche and palaeosol formation. He further stated that the lithophysae are lined with orthoclase and quartz, and the cavities are partially filled with calcite, quartz, and chlorite. At the Kingston mine, calcite occurred as thin massive veins cutting the lode and as modified rhombohedral crystals to 7 mm with inclusions of cuprite and chalcocite. Later, a second generation of clear calcite, following the orientation of the earlier calcite, overgrew the fragments, forming uniform crystals beyond the rim of the crust. When the calcite was dissolved with dilute sulfamic acid, it was noted that white semitranslucent florets of datolite occurred on the crystalline copper. Porous, relatively soft, fine-textured and somewhat friable, chalk normally is white and consists almost wholly of calcium carbonate as the common mineral calcite. The minerals are deposited in lakes, deltas and meander further downstream, where they build up and form sedimentary rocks such as calcite, selenite, pyrite and dolomite. Other associated minerals include tetrahedrite, calcite, and gypsum. Vein minerals are ferroan dolomite, barite, calcite, pyrite, and quartz. Vein minerals are barite, calcite, ferroan dolomite, and sphalerite. Red chalcedony-lined geodes were prevalent at one time, their inclusions typically being quartz, calcite, ferroan dolomite, and iron sulfide microcrystals. The faults are of limited width, filled with calcite, pyrite and remoulded clay. Mees F The unsuitability of calcite spherulites as indicators for subaerial exposure. There are karst landscapes in calcite areas such as parts of Yorkshire and Derbyshire. Show More Sentences The minerals considered include calcite, gypsum, hydromagnesite, nesquehonite, and sepiolite. Like all echinoderms, the Ophiuroidea possess a skeleton of calcium carbonate in the form of calcite. Rivers which emerge from springs may produce tufa terraces, consisting of layers of calcite deposited over extended periods of time. Calcium carbonate is deposited where evaporation of the water leaves a solution supersaturated with the chemical constituents of calcite. However, quartz, feldspar, several clay minerals, bayerite and calcite were common in sediment samples. The mineralogical composition of the sample is dominated by calcite, quartz and illite. Magnetite contains inclusions of calcite, apatite, phlogopite, and pyroxenes. Quantitative gasometric determination of calcite and dolomite by using a Chittick apparatus. Gangue minerals include quartz, calcite, adularia, minor fluorite, and trace amounts of pyrite, marcasite, and chalcopyrite. Some concretions are complex in structure and contain crystals of galenite, sphalerite and calcite. The researchers used a method known as uranium-thorium dating to cross-check the carbon-dating estimate of the calcite layer's age. Crystals of calcite, quartz, dolomite or barite may line small cavities in the rock. Ca is strongly correlated with Mg reflect a common mineralogic sources, may be weathering of amounts of calcite and dolomite. It turns out that this brittlestar is covered with thousands of microscopic crystals made of the mineral calcite. They contain fine-grained siliciclastic material with minor amounts of bioclasts cemented by calcite. Secondary minerals in these rocks include chlorite, calcite, Iron hydroxide, opaque mineral, Leucoxene and quartz. It mostly occurs as massive subhedral calcite with some rhombohedron faces. The sets of minerals of this skarn include quartz, calcite, grossular, augite, and gypsum. Accessory minerals are represented by apatite, zoisite, sphene, calcite, fluorite and magnetite. Minerals associated with graphite include quartz, calcite, micas and tourmaline. Show More Sentences Their steam cavities are usually filled with calcite, but sometimes with quartz. Early replacive calcite and late replacive calcite exhibit similar carbon isotope and different oxygen isotope compositions. The primary source of the calcite in limestone is most commonly marine organisms. Other minerals from the sedimentary rocks include pyrite, calcite, barite, manganite, and pyrolusite. These organisms secrete shells made of aragonite or calcite, and leave these shells behind when they die. This led to the extinction of carbonate producers such as brachiopods and corals that relied on dissolved calcite to survive. A shell consisting of calcite can, for example, dissolve while a cement of silica then fills the cavity. Carbonate rocks dominantly consist of carbonate minerals such as calcite, aragonite or dolomite. It consists of coccoliths, microscopically small calcite skeletons of coccolithophores, a type of algae that prospered in the Cretaceous seas. The cements binding these grains together are typically calcite, clays, and silica. In ophiuroids, the calcite ossicles are fused to form armor plates which are known collectively as the test. They contain translucent white calcite and pale-green chloritic stains. A shell is said to be recrystallized when the original skeletal compounds are still present but in a different crystal form, as from aragonite to calcite. Strong intertidal currents wash the 'seeds' around on the seabed, where they accumulate layers of chemically precipitated calcite from the supersaturated water. Like sand dollars, crinoids have skin on top of a hard calcite shell. With the lysocline shrinking, there were fewer places for calcite to dissolve in the ocean, considering calcite only dissolves at deep ocean depths. The Randville dolomite and the Vulcan Iron Formation contain vugs of calcite scalenohedra, dolomite rhombohedra, pyrite cubes, and marcasite blades. Microsparite and sparite calcite crystals are mostly equant to elongated rhombohedrons or scalenohedrons, but also a few prismatic crystals were observed. Calcium carbonate occurs as aragonite, calcite and dolomite. Here calcite is present as dense crystals in abundant glaebules where it forms micritic hypocoatings that cement quartz grains of varying size and shape. Show More Sentences In the third stage of carbonation, the previously originated carbonate formations recrystallize giving rise to very large calcite and aragonite crystals. When conditions are right for precipitation, calcite forms mineral coatings that cement the existing rock grains together, or it can fill fractures. Examples from Classical Literature It was not common carbonate of lime, for the crystals were rhombohedral and did not show the cleavage of calcite. Many limestones are rich in aragonite, but this in course of time tends to recrystallize as calcite. Calcium carbonate may crystallize in either of two forms, calcite or aragonite. The shell consists of carbonate of lime, under one or both of the forms known to mineralogists as calcite and aragonite. The rauchstein of the modern section is distinguished by stringers of calcite, which give it at times a brecciated appearance. It is rhombohedral in crystallization and isomorphous with calcite and chalybite. The rocks along this stream are all sandstones, limestone and conglomerates, with many thin calcite veins. Those stones which show electricity on the application of pressure are such as the fluorspar, calcite, and topaz. Thus calc spar is a common name for calcite, heavy spar for barite, needle spar for aragonite, and so on. The density of the globules is similar to that of ordinary varieties of calcite. Cerium looks like iron, having both its color and lustre, but is heavier, and has the hardness of calcite. The skeletons and shells of animals are made of calcite, a common mineral formed by the uniting of carbon, oxygen, and calcium. The septa, radial plates of calcite reaching from the periphery nearly or quite to the centre of the coral-cup or calicle. Their occurrence here is in calcite veins in a bituminous limestone, but little seems to be known of their origin. A dark compact rock, in which calcite and sericite predominate. A vase of calcite, also dedicated by Entemena, has been found at Nippur. Other gems discovered at the state park include amethyst, garnet, peridot, jasper, agate, calcite, barite and quartz. The most common petrifying materials are calcite, silica, and pyrite. Find more words! 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Words that rhyme with calcite What is the plural of calcite? What is the adjective for calcite? What is the noun for calcite? Use our Sentence Generator Nearby Words calcinosis calciner calcined calcine calcination calcimining calcitonin calcitriol calcium calcrete calcspar calculability 7-letter Words Starting With c ca cal calc calci calcit