Sphalerite Cadmium Deposits Kenya

Medical geology - AAPG Wiki

Cadmium has great affinity for sulphides and is therefore associated with sulphide deposits. It has very similar tetrahedral covalent radius to that of zinc; thus, it can displace zinc from sphalerite (ZnS). Cadmium is highly toxic to humans. According to Hutton, it mainly accumulates in soft tissues such as the kidneys and liver.

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Some Aspects of the Geochemistry of Sphalerite, Central

sphalerite-pyrite-tennantite-galena, and sphalerite-pyrite-enargite-tennan- tire-galena. Quartz and, locally, other gangues are present. The sphalerite samples contain from 12 to 0.05 weight percent iron and detectable amounts of a restricted suite of minor elements, principally manganese, cadmium, copper, and lead. Manganese correlates directly

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Sphalerite - University of Auckland

Sphalerite Sphalerite is the major ore of zinc. It is a sulphide mineral and exhibits a wide range of physical properties, such as colour, transparency, streak and lustre, because many elements can substitute for Zn in its crystal structure. Iron is the principle substituent, but cadmium, gallium and iridium can also substitute to economic volumes making sphalerite the leading commercial

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Minerals | Free Full-Text | A Density Functional Theory

Ye et al. investigated the effect of three typical impurities (iron, copper, and cadmium) on the flotation behavior of sphalerite . They also studied the electronic structures of bulk sphalerite containing 14 typical kinds of impurities by . Li et al. calculated the electronic property of pyrite crystals containing As, Se, Te, Co, or Ni atoms.

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Sphalerite R040136 - RRUFF Database: Raman, X-ray

V. Galena, sphalerite and chalcocite, The Canadian Mineralogist, 18, 365-372 Hurley T D, Crocket J H (1985) A gold-sphalerite association in a volcanogenic base-metal-sulfide deposit near Tilt Cove, Newfoundland, The Canadian Mineralogist, 23, 423-430

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Sphalerite chemistry, Niujiaotang Cd-rich zinc deposit

Sphalerite in the Niujiaotang Cd-rich zinc deposit, Duyun, Guizhou is characteristically light-yellow in color with significant enrichment of cadmium which ranges from 0.83% to 1.97% (averaging 1.38%) in concentration in the mineral, corresponding to an enrichment coefficient as high as 30. 47 to 72. 96. In comparison with other major Pb−Zn deposits in the world (the Mississippi Valley

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Mineral deposit - Native metals | Britannica

Mineral deposit - Mineral deposit - Native metals: Only two metals, gold and platinum, are found principally in their native state, and in both cases the native metals are the primary ore minerals. Silver, copper, iron, osmium, and several other metals also occur in the native state, and a few occurrences are large enough—and sufficiently rich—to be ore deposits. One example is the rich

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LECTURE 5- CHEMISTRY OF MINERALS REVISED

The analyses shown in Table 5.2 (a) show that sphalerite may be nearly pure zinc sulfide, or it may contain considerable quantities of iron and minor amounts of manganese and cadmium. This observation is made clear when the analyses are recalculated in atomic proportions as indicated below in Table 5.2 (b). Table 5.2 (b).

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Sphalerite-galena geothermometers; distribution of cadmium

Feb 01, 1995· The cadmium galena-sphalerite geothermometer gives reliable temperatures for high-temperatures assemblages (>250 degrees C). Its applicability for low-temperature deposits is doubtful. The assumption that coexisting sphalerite and galena equilibrated with respect to cadmium distribution at the majority of deposits studied seems to be reasonable.

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Sphalerite | Article about sphalerite by The Free Dictionary

sphalerite (sfăl`ərīt, sfā`–), mineral composed of zinc sulfide, usually containing some iron and a little cadmium.It occurs in crystals of the isometric system but more generally in cleavable, compact masses. It is transparent to translucent and varies greatly in color, iron-free specimens being pale yellow and those with iron being brown, red, black, or green.

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