Kristalohemijska ispitivanja sfalerita iz polimetaličnog Pb - Zn rudnog ležišta Kiževak

Abstract

With the X-ray, chemical and spectrochemical method there were investigated monomineral concentrations of the brown and yellow sphalerite varietys from the polymetallic Pb-Zn ore deposit Kiževak from the different horizons at 670, 690 and 710m. There were calculated sphalerite unit cell dimensions for which it was confirmed that increase with the increasing of the Fe, FeS and (Fe,Mn,Cd)S contents and that decrease with the increasing of the Cu content. Sphalerite compositions and their unit cell dimensions are more or less different at different depths, and also they are different for the brown and yellow varietys. These differences are also manifested at mutually different slopes of the lines which are representing the dependence of the unit cell dimensions by sphalerite compositions from the different horizons, and also for sphalerites of the different color. These mutually different slopes indicate to the different chemical compositions (from which is of the most significance the Fe content), but also probably to the different formation conditions of the sphalerite, and according to that to the different formation conditions of the individual horizons and varietys of this ore deposit. Contents of the (Fe,Mn,Cd)S most probably are not useful for the objective conclusions at the crystallographical sense, because they show considerable lower “ending” unit cell dimensions than Fe and FeS contents, which are showing the same. Calculated unit cell dimensions from the X-ray investigations are considerable bigger related to that which are calculated from the equations from the literature datas, while that difference decrease with the increasing of the Fe and FeS contents.