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chalcopyrite
Book article from: A Dictionary of Earth Sciences
chalcopyrite ( copper pyrites ) Most common copper mineral, CuFeS 2 ; sp. gr. 4.1–4.3; hardness 3.5–4.0...
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siderite
Book article from: A Dictionary of Earth Sciences
...clay into ironstone , also as a gangue mineral in hydrothermal veins together with other metallic ores (e.g. pyrite , chalcopyrite , and galena ) and as a replacement mineral in limestone ; dissolves slowly in cold, dilute hydrochloric acid, which effervesces...
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pyrite
Book article from: A Dictionary of Earth Sciences
...occurs with other sulphide ores genetically associated with basic and ultrabasic rocks , and together with pyrrhotine and chalcopyrite ; very widely distributed in a great variety of environments, and found in igneous rocks as an accessory mineral , in sedimentary...
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ilmenite
Book article from: A Dictionary of Earth Sciences
...igneous rocks , e.g. gabbro and diorite , in quartz veins and pegmatites , in gneisses , in association with hematite and chalcopyrite , and because it is resistant to weathering it occurs extensively in alluvial deposits with magnetite , monazite , and rutile...
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cryolite
Book article from: A Dictionary of Earth Sciences
...parting; occurs in pegmatites that have been enriched with fluorine, and in association with siderite , quartz , galena , chalcopyrite , fluorite , and cassiterite . The powder becomes almost invisible in water due to its low refractive index . Synthetic cryolite...
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uraninite
Book article from: A Dictionary of Earth Sciences
...and in association with monazite , zircon , and tourmaline , in hydrothermal veins together with cassiterite , pyrite , chalcopyrite , and galena , and as a detrital material in alluvials . It is a major ore mineral for uranium metal.
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stannite
Book article from: A Dictionary of Earth Sciences
...normally the grains are irregular or massive ; occurs in hydrothermal tin- ore deposits and in association with cassiterite , chalcopyrite , and wolframite , also in stanniferous sphalerite – galena ores, and associated with sphalerite, pyrrhotite...
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porphyry deposit
Book article from: A Dictionary of Earth Sciences
...alteration halos . Most deposits are 3–8 km across and several kilometres deep. They consist of disseminated chalcopyrite and other sulphides mined on a large scale from open pits . The ore is low grade (less than 1% Cu) but of great economic...
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pyrrhotite
Book article from: A Dictionary of Earth Sciences
...magnetic; occurs in igneous rocks, e.g. gabbro or norite , as disseminated grains, and also in metamorphic contact zones in association with chalcopyrite and pyrite . Pyrrhotite was used formerly for the production of sulphuric acid.
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geothermometer
Book article from: A Dictionary of Earth Sciences
...disappears upon heating); ( d ) unmixing or exsolution lamellae of mineral pairs below a particular temperature, e.g. chalcopyrite—bornite at 500°C; ( e ) temperature-dependent element distribution between co-existing minerals...
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