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Sentence Examples At Azegour, Morocco, uraninite occurs in tactite with molybdenite, chalcopyrite, barite, pyrite, hematite, and garnet. Microcrystals of pyrrhotite, goethite, pyrite, galena, and calcite are found on the dumps. Chalcopyrite is occasionally found in the manto orebodies as small crystals on sphalerite and pyrite. The mordenite is associated with a hemispherical form of pale yellow calcite and cubic pyrite. Early investigators recognized bitumen as having a strong spatial relationship with gold, uraninite and pyrite. In one specimen stephanite was intimately associated with pyrite in a matrix of tabular calcite crystals, all on quartz. The central potassic core normally contains low-grade mineralization consisting of minor chalcopyrite, molybdenite, and pyrite. Matrix minerals of the dolostone septaria are ferroan dolomite, quartz, calcite, and pyrite. A number of other minerals, including silica, may play a role, but some of the most spectacular fossils are preserved in pyrite. Many conclude that because pyrite is cubic, pyrrhotite must be hexagonal, as it often appears. A quick, qualitative analysis of valves during SEM work confirmed the presence of pyrite and the calcium phosphate composition of the carapace. The lamellar sublayer of each ligament has been replaced by localized concentrations of framboidal pyrite. Where pyrite crystals have been lost, it can be seen that quartz did not penetrate pyrite. The ore zone is a combination of veinlets, lenses, and nests of pyrite and quartz. Some pyrrhotite is relatively unstable in humid environments, decrepitating like pyrite. Some visitors gather around the sparkling amethyst geodes or the shining pyrite crystals. Similarly, silver has been described replacing a variety of silver minerals, pyrite, and galena. Vein minerals are barite, calcite, chalcopyrite, kaolinite, pyrite, sphalerite, and wurtzite. The primary ore minerals were not investigated, although galena and pyrite were found as relict masses on several occasions. Some of the gold formed discrete isolated crystals to 2 mm perched on tiny cubic pyrite crystals in vugs that range to 1 cm across. Show More Sentences Another relatively new discovery is pyrite as attractive, sharp, cubic crystals, to 1 cm on edge, altered to goethite. Minimal fractionation accompanies the precipitation of pyrite from dissolved sulphide. Associated minerals include various pyroxenes and zeolites in addition to the more familiar lazurite, sodalite, pyrite, and carbonates. It is dominated by the deposition of calcite with minor pyrite, marcasite, barite, anhydrite and gypsum. Goethite and lepidocrocite, FeOOH, are common replacement agents of pyrite and also occur as stains on minerals exposed to weathering. Many of these calcite crystals and crystal groups are partially or completely covered with an overgrowth of pyrite. Notable occurrences of this include goethite psedomorphing pyrite, with exsolved gold near the surfaces of the replacement. On the dumps I found galena, pyrite, and rugs full of quartz, dolomite, and a few tiny, water-clear fluorites. The occurrence is in deformed, silicified marble accompanied by forsterite, diopside, zcolites, scapolite, and pyrite. Generally associated minerals included other silver amalgams, covellite, and pyrite. For example, microcrystalline pyrite is ubiquitous on the inner surface of cell walls, within lignified cell walls and in the middle lamella. The wall rock was highly altered and consisted of a groundmass of pyrophyllite and fine-grained pyrite. They noted that good pseudomorphs of limonite after pyrite, both as cubes and as pyritohedra, are common, especially in bodies of massive pyrite. The common presence of limonite suggests that there was a significant quantity of pyrite in the area prior to oxidation. Other sulfides, including pyrite, marcasite, chalcopyrite, and pyrrhotite, are occasionally found as well. We have also seen several specimens in which pyrite has replaced a hexagonal mineral that was probably pyrrhotite. Frank Knaus found crude 3.1-cm pyrite cubes covered with a crust of limonite. Both siderite and massive pyrite were mapped as noncommercial iron ore by the Eagle mine staff. The pods were composed of large masses of black sphalerite containing vugs of petzite on gold, galena, rhodochrosite, chalcopyrite, and pyrite. The bodies of many smaller concretions are surrounded by a shell of fine-grained pyrite. Show More Sentences It can digest the mineral pyrite to extract sulphur, and in the process it concentrates gold within the mineral into tiny grains. Galena may also overgrow clausthalite, and replace pyrite and chalcopyrite. Iron and copper sulfides of this region are predominately pyrite, pyrrhotite, chalcopyrite, arsenopyrite, bornite, and marcasite. One quick stop was made at the abandoned New First of May mine, where on the ore pile we found galena, pyrite, arsenopyrite, and fluorite. Pseudomorphs of marcasite, chalcopyrite, pyrite, arsenopyrite, pyrargyrite, magnetite, and quartz after pyrrhotite have been reported. Massive polycrystalline pyrite may also overgrow the plant axis, sometimes completely enclosing it. Other common minor constituents of eclogite include kyanite, orthopyroxene, rutile, amphibole, pyrite, and white mica. Nodules of pyrite whose surfaces are covered with tabular marcasite crystals are present in the Olentangy Shale in Pickaway and Pike Counties. Vein minerals are barite, calcite, chalcopyrite, galena, pyrite, and sphalerite. These molds are now lined with crystals of celestine, fluorite, pyrite, strontianite, dolomite, calcite, sphalerite, and barite. Matrix minerals of the septaria are ferroan dolomite, quartz, calcite, and pyrite. The major mineral constituents of coal balls are calcite, dolomite, ferroan dolomite and pyrite. Other than clay minerals, calcite and pyrite are the most common secondary minerals present. The assemblage present included quartz, chalcopyrite, pyrite, sphalerite, magnetite, and hematite. Both the sandstone and andesite show strong quartz and chert veining and carry disseminated pyrite. In the orebody galena occurred as large masses associated with pyrite, chalcopyrite, and tennantite. Gold occurs in quartz veins with chalcopyrite, galena, pyrite, and sphalerite. Other minerals mentioned from the mine by Dunham include galena, sphalerite, pyrite, chalcedony, and minor marcasite and pyrrhotite. Calcic amphiboles, including hornblende and actinolite are abundant, and probably are alteration products, which also include albite, orthoclase and rare pyrite. 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. Show More Sentences 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. Ultrastructurally, parenchymatous cell walls are coalified, whereas microcrystalline pyrite plus coalified material were observed within lignified cell walls. Some of the cavities contain bits of iron oxides, and relatively sharp octahedra have been found on weathered pseudomorphs of limonite after pyrite. Twenty specimens permineralized by limonite and pyrite were studied. The fine-grained sediment of the matrix consists chiefly of pyrite or marcasite, and their surfaces are often covered with outward-projecting crystals of pyrite or marcasite. The bodies of iron sulfide nodules in the Olentangy Shale are composed of fine-grained pyrite, and their surfaces are frequently covered with tabular crystals of marcasite. The ore shoot is mainly in the Molas Formation and is surrounded by a silicified envelope that contains galena, sphalerite, chalcopyrite, tetrahedrite, and pyrite. A dressed product of copper works in South America, consisting of grains of native copper mixed with pyrite, chalcopyrite, mispickel, and earthy minerals. The unoxidized sections consist primarily of marmatite ore, which is composed primarily of pyrite, marmatite, galena, siderite, and minor chalcopyrite. Accessory chlorite, magnetite or ilmenite, titanite, apatite, partly chloritized biotite, epidote, pyrite and sometimes cummingtonite, are present. 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 minerals that are present in this zone include pyrite and epidote. Vein minerals are ferroan dolomite, barite, calcite, pyrite, and quartz. The skarns also contain hornblende, calcite, pyroxene, tremolite, pyrrhotite, molybdenite, galena, chalcopyrite, arsenopyrite, garnet, and pyrite. Gangue minerals include quartz, calcite, adularia, minor fluorite, and trace amounts of pyrite, marcasite, and chalcopyrite. These minerals include sheet kaolinite, vermiform kaolinite, k-feldspar, pyrite crystals, corrosion quartz and corrosion feldspar. The faults are of limited width, filled with calcite, pyrite and remoulded clay. Below that cap is a supergene zone containing pyrite, chalcopyrite, and sphalerite. They can be weakly mineralized in places with arsenopyrite, pyrite and rare jamesonite and boulangerite in a quartz gangue. The gold is associated with pyrite, pyrrhotite, quartz in veinlets, amphiboles and garnets. Show More Sentences Sulfur is contained in pyrite, a common accessory mineral, particulary in the more mafic rocks of the suite. Creamy white quartz contains black and grey sulfides with pyrite along the margins, cut by clear aphanitic chalcedony veins. Shales may also contain concretions consisting of pyrite, apatite, or various carbonate minerals. Long Work was another copper mine a little further down the valley, worked for malachite and pyrite from Elizabethan times. Mineralization is comprised of pyrite, galena, sphalerite, sulphosalts and chalcopyrite hosted in a hydrothermal breccia matrix. The clay layers are mainly composed of organic matter, clay minerals, quartz, feldspars, ankerite, pyrite, etc. Within the intrusion, the mineralized zone is variably silicic, chloritic, and contains variable concentrations of pyrite, arsenopyrite and gold. The sulphidic ore consists of pyrrhotite and lesser amounts of pyrite, sphalerite, galenite, and chalcopyrite. The matrix includes scattered crystals of pyrite and hematite and the rock is penetrated by complicated branching fractures and vugs. These results show that paragenesis of mineralization of chalcopyrite, pyrite, malachite, azurite, garnet and magnetite occurred. By waste were replaced society used pyrite cinders, whose use is restricted due to their scarcity and dihydrate gypsum. Other minerals from the sedimentary rocks include pyrite, calcite, barite, manganite, and pyrolusite. The particles of pyrite and quartz are also located in the material distinguishably. The sulphide minerals consist of varying proportions of pyrite, pyrrhotite and sphalerite with lesser galena, arsenopyrite and chalcopyrite. Torrento C, Cama J, Urmeneta J, Otero N, Soler A Denitrification of groundwater with pyrite and Thiobacillus denitrificans. The dominant minerals are pyrite, tetrahedrite, sulfosalts, sphalerite, galena and chalcopyrite. Sulfide minerals identified within the zone include chalcopyrite, galena, sphalerite, tetrahedrite, and pyrite. The dominant minerals are pyrite, tetrahedrite, sulfosalt, sphalerite with lesser galena and chalcopyrite. These are characterized by pyrrhotine and pyrite poorly d with low quantities of chalcopyrite. Silicification and boxwork openings after the mineral pyrite in the southern feature are encouraging for stronger mineralization at depth. Show More Sentences Mineralization consists of megascopic and microscopic molybdenite, pyrite, minor chalcopyrite and rare bornite. It consists of shear parallel 1-3cm thick quartz ribbons and boudins with pyrite, chalcopyrite and sphalerite. The primary and supergene sulphide mineralised zone consists of chalcocite, pyrite, and bornite vein swarms which are silver rich. Iron sulphates of marcasite and pyrite can also be found along with lime in some high iron content clays. The mineralogy of the Copper lodes consists of chalcopyrite, pyrite, chalcocite, covellite and marcasite. The dominant sulphide minerals are pyrite and chalcopyrite with minor sphalerite and marcasite. At the periphery of this replacement body, thin lenses of relatively massive pyrite are parallel to schistosity in the gabbro. The gold mineralization is associated with pyrite and pyrrhotite and varies from fine-grained disseminated to blebby coarse-grained. Mineralization at Perkoa consists of a massive pyrite, sphalerite, pyrrhotite, baryte ore, with small amounts of lead and copper sulphides. The new collection is a mixture of blackened silver, raw crystals, labradorite, black spinel, pearl chalcedony and pyrite. Mineralization is associated with siderite-albite veins and breccias with chalcopyrite, arsenopyrite, pyrite, and their oxidized equivalents. The Randville dolomite and the Vulcan Iron Formation contain vugs of calcite scalenohedra, dolomite rhombohedra, pyrite cubes, and marcasite blades. Kaolinite, illite, quartz, microcline, dickite, mordenite, gamma alumina and iron rich minerals, such as pyrite and hematite, constituted the mineral makeup. Within the deeper diorite unit, some intense sericite alteration was observed with arsenopyrite, pyrite and pyrrhotite, generally as selvedges to quartz veins. Disseminated native gold, tetrahedrite, telluride minerals, pyrite, arsenopyrite, and chalcopyrite are the primary metallic minerals in the veins. Electron microprobe analysis has shown that the gold and silver-bearing minerals of the vein are the telluride minerals petzite and hessite, which are inclusions in pyrite. Geochemical surface sampling at Trapper has demonstrated that gold is associated with the sulphides pyrite, galena, sphalerite and chalcopyrite, plus sulphosalt minerals. The alteration consists primarily of a hematite, carbonate, albite, and sericite assemblage with the presence of pyrite being a strong indicator of the gold mineralization. The mineralization occurs within breccia cement and is associated with hematite, chlorite, ferroan dolomite, minor thorite, ilmenorutile and pyrite. The deposit hosts gold, pyrite, pyrrhotite, arsenopyrite, antimonite. Show More Sentences The mineralisation consists of chalcopyrite, cassiterite, sphalerite, pyrite, and arsenopyrite, and is essentially stratiform, dipping to the northwest at about 30 degrees. The mineralization is comprised of pyrite, sphalerite, silver rich galena, chalcopyrite, arsenopyrite, tennandite, tetrahedrite, native gold, native silver and quartz. Iron monosulfide and pyrite concentrations in the surficial drain sediments of 3 major tributaries associated with poor water quality in the lower floodplain were measured. Copper diselenide can occur both as a marcasite and a pyrite. Mineralization consists of narrow, high-grade quartz-carbonate veins containing freibergite and tetrahedrite, native gold, galena, sphalerite, chalcopyrite and pyrite. Examples from Classical Literature Marcasite and pyrrhotite, other iron sulphide minerals, are frequently found with pyrite and are used for the same purposes. A few small crystals of pyrite were then placed in the bottle of solution, and the gold began immediately to precipitate on them. Even when only a small proportion of mundic, pyrite or marcasite is present, it is highly objectionable for several reasons. The German term in the Glossary for panes ex pyrite is stein, the same as the modern German for matte. The mineral is harder than chalcocite, but less hard than pyrite, being easily scratched with a knife. He, however, puts it on one side as merely a synonym for pyrite, nor can it be satisfactorily defined in much better terms. Before the war domestic sources supplied a fourth to a third of the domestic demand for pyrite. The most common petrifying materials are calcite, silica, and pyrite. Wherever flint and pyrite are to be had these are used for striking fire. The principal use of pyrite is in the manufacture of sulphuric acid. Find more words! 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Words that rhyme with pyrite What is the plural of pyrite? What is the adjective for pyrite? What is the noun for pyrite? Translations for pyrite Use our Sentence Generator Nearby Words pyrimidines pyrimidine pyrimethamine pyriform pyridyl pyridoxine pyrites pyritic pyro pyrochemical pyroclastic pyroclastic flow 6-letter Words Starting With p py pyr pyri pyrit