... matrices of both marcasite and pyrite (Fig. 6), indicating a Ni-Fe substitution. 429 Experimental works on the solid solution in the FeS2-NiS2 system by Clark and Kullerud 430 (1963) showed that up to 14 wt% Ni may substitute for Fe in the FeS2 structure at 200°C. 431 Furthermore, there is a lack...

... sequences [FeS2 in the interlayer, distinguished by their site 221 occupancies (Table 7). The average occupancy factor for Fe and S in tetrahedra [Fe(1)S4] is ~0.85, 222 whereas the average occupancy in tetrahedra [Fe(2)S4] is just ~0.15. It could be supposed that the 223 ideal mariakrite structure might...

... measured in air, R max / R min (λ, nm) (%): 16.0/9.2 (470); 19.6/9.3 (546); 18.5/9.0 (589); 32.0/9.3 (650). Chemical composition (electron microprobe, average of 6 points, wt. %): K 23.78, Ca 0.44, Fe 34.75, Mn 0.60, Zn 0.47, S 39.46, Total 99.5, that corresponds to empirical formula (K 0.98 Ca 0.02 ) 1.00...

... established by experimental measurements and theoretical calculation. Many researchers have carried out experimental measurements on various sulfide systems: ZnS–PbS–FeS2–S ( Grootenboer & Schwarcz, 1969 ); FeS 2 –ZnS–PbS ( Kajiwara et al. , 1969 ; Smith et al. , 1977 ); ZnS–PbS ( Rye...

..., may be inactive Constructional sulphides. Fe and Zn sulphides, anhydrite crusts Texturally immature, often microporous Type IIIb Brecciated mound talus Inactive, associated with focused hydrothermal flow Variable composition; Cu, Fe, Zn sulphides; result of mass wasting Product of reworking of wasted...

... spectrometer to evaluate grain-scale compositional heterogeneity. Quantitative mineral compositional data were obtained using a Cameca SX-Five electron probe microanalyzer. X-ray lines and standards were S Kα (pyrite), Pb Mα (galena), As Lα (GaAs), Se Lα (Bi 2 Se 3 ), Fe Kα (pyrite), Cu Kα (chalcopyrite), Zn...

... and deformation twinning. Specimens containing co-existing hexagonal pyrrhotite-sphalerite occurring within pyrrhotite, pyrite, spha lerite and magnetite-bearing assemblages were analysed by electron probe micro -analyser. The average composition of the co-existing pair is shown in Table I. Elements Fe S Zn Cd Mn...

... measurements made under hydrostatic conditions with helium as a pressure-transmitting medium and non-hydrostatic conditions (no pressure-transmitting medium) in order to determine any possible influence of the applied stress state on the vibrational properties of FeS 2 . We also report the use of Zn...

... of flushing of Cu is highest from the vadose zone to phreatic zone followed by Fe, Zn, Mn, Pb and toxic trace elements like Hg and As. JOURNAL GEOLOGICAL SOCIETY OF INDIA Vo1.54, Nov.l999, pp.501-514 'Irrace Element Geochemistry of Groundwater from Behedi Basin, Nasik District, Maharashtra N. J. PAWAR and 1...

... such as Cu , Zn , Pb , Ni. Cr, Co, Li and Cd were also analysed by AAS after digestion with H 2SO/HF acid. Au was analysed · by AAS after digestion with aqua regia and extracted with dibutyl sulphide. The precision of the results is : ± 3% for Si02 and Fe~ O:; , ± 0.2 % for all other major oxides and ± 0.5...

..., and Mössbauer parameters of the pyrites MS 2 (M = Fe, Co, Ni, Cu, Zn) . Phys. Rev. B , 29 , 6774 – 6783 . Layek A. Somnath M. Partha P.R. ( 2013 ): Increase in open circuit voltage by the incorporation of band gap engineered FeS2 nanoparticle within MEHPPV solar cell . J. Mater. Sci...

... Mean (5 spots) Range Stand. Dev. (s) Reference Material Ni 62.97 62.97-67.05 0.29 Ni metal Co 0.25 0.00-0.51 0.04 Co metal Fe 6.43 5.01-8.41 0.11 FeS2 S 0.29 0.00-0.78 0.03 FeS2 Ge 28.47 27.57-29.81 0.16 Ge metal Total 100.10 Table 3. Parameters of electron backscatter diffraction (EBSD...

..., with the participation of bacterial communities ( Nemerov et al., 2010 )) and how much was contributed by a deep source identified with a magmatic intrusion. According to ( Laverov et al., 2000 , p. 90), most of the ore elements (Au, Pt, W, Mo, REE, Ni, Co, Cr, Pb, and Zn) were supplied to the zone of ore deposition...

...}}\mathit{Am}}\] \end{document} The web database www.mindat.org (visited in August 2008) lists as many as 156 As-bearing sulfide minerals and solids. The most important sources of As are likely to be arsenopyrite (FeAsS) and arsenian pyrite (FeS 2 ), followed by tennantite [(Cu,Ag,Zn,Fe) 12 (As,Sb...

... for Fe, Cu, and Zn. The following standards were used during SEM-EDS and microprobe analyses: skutterudite for native arsenic, PbS for galena, pure Ag and Au for Au-bearing native silver, pure Ge for argyrodite, FeS2 for pyrite, ZnS for sphalerite, and CdS for a CdS phase (MINM-25-53, ASTIMEX Scienti c...

..., marcasite, sphalerite, galena, millerite and cobaltite–gersdorffite. Magnetite, coloradoite, and Au–Ag alloy occur locally. The platinum-group minerals (PGM) include, in order of abundance: borovskite [(Pd 2.6 Ni 0.35 Fe 0.12 ) ∑3.07 (Sb 1.06 Bi 0.06 ) ∑1.12 Te 3.81 )], telluroan sudburyite [(Pd 0.97 Ni...

... into sulfide crystals (FeS2, CdS, PbS) at 450–500 °C vary from n ⋅10 −4 to n ⋅10 −2 wt.%, which is nearly two orders of magnitude higher than the “true” isomorphous capacities of these crystals. For FeS, the incorporation limit of Au does not depend on defects (Fe vacancies). This phenomenon has not been...

... intrusions and Mesozoic carbonate and silicic shale host rocks contain Cu(-Mo-Au)-porphyry, Cu-Zn(-Fe) skarn, and metasomatic Pb-Zn (carbonate replacement) mineralization from ~400- to at least 1,200-m depth below the surface. The Mesozoic sedimentary rocks are unconformably overlain by a stratovolcanic...

... independently of the type of the solution transfer. Prevailing As and Fe complexes are considered. The calculated models for the three types of interaction show that the redox potential in the solution varies from –0.055 V at the ends of the Asp-containing ore column to –0.55 V in its central zone...

... an acceleration voltage of 20 kV, a beam current of 20 nA, and a beam diameter of 1 μm. The analyses were calibrated using a set of standard materials representing specific elements in pyrite. They included FeS 2 (Fe, S), Co, Ni, CuFeS 2 (Cu), Pb, Sb 2 S 3 (Sb), Tl, Sn, ZnS (Zn), FeAsS (As), Au (Au), Bi, Ag...