Mineralogical composition

Peter, J.M. and Scott, S.D. (1988) Mineralogy, composition, and fluid inclusion microthermometry of seafloor hydrothermal deposits in the Southern Trough of Guaymas Basin, Gulf of California. Can. Mineral, 26, 567-587. 

Table 1.11 Average composition of Pacific Ocean nodules and mineralogical composition of manganese nodules.

It is found that the dissolution of zinc sulfides occurs more rapidly when they are in contact with copper sulfide or iron sulfide than when the sulfides of these types are absent. This enhancement is brought about by the formation of a galvanic cell. When two sulfide minerals are in contact, the condition for dissolution in acidic medium of one of the sulfides is that it should be anodic to the other sulfide in contact. This is illustrated schematically in Figure 5.3 (A). Thus, pyrite behaves cathodically towards several other sulfide minerals such as zinc sulfide, lead sulfide and copper sulfide. Consequently, pyrite enhances the dissolution of the other sulfide minerals while these minerals themselves understandably retard the dissolution of pyrite. This explains generally the different leaching behavior of an ore from different locations. The ore may have different mineralogical composition. A particle of sphalerite (ZnS) in contact with a pyrite particle in an aerated acid solution is the right system combination for the sphalerite to dissolve anodically. The situation is presented below ... 

Mineralogical Compositions of Reactor Solids Determined by X-ray Diffraction (74)... 

Elliott El.A., Sparks D.L. Electrokinetic behavior of a paleudult profile in relation to mineralogical composition. Soil Sci 1981 132 402-409. 

A miniaturized MB spectrometer MIMOS II was developed for the robotic exploration of Mars, where it provided fundamental information about mineralogical composition and alteration processes, helped to classify rocks and soils, aided geologic mapping, was instrumental in assessing habitability of past and present environments, and identified potential construction resources for future human explorers. The applicability of the instrument as a process monitor for oxygen production and prospecting tool for lunar ISRU has been demonstrated. The characterization of air pollution sources and the study of mixed-valence materials as a function of depth in soil are examples of terrestrial in situ applications. MIMOS lla with additional XRF capability will open up new applications. 

The pH, EC and Fe3+ were used as control parameters. The first two were measured with an Orion probe combined pH/ATC electrode Triode and a conductivity cell DuraProbe ref. 0133030. Fe3+ was determined by molecular absorption (thiocyanate method). Mineralogical composition of the precipitates was determined by X-ray powder diffraction (XRD). Scanning electron microscopy, combined with an energy dispersive system (SEM-EDS), allowed the observation of morphological and compositional aspects of the precipitates. 

Research work has shown that cassiterite from various deposits and often even from parts of the same deposit differ in chemical composition, colour, flotation properties, chemical activity and electrophysical characteristics. Therefore, the mineralogical composition of tin ores and the physiological properties of the minerals, in particular cassiterite, determine to a great extent the quantity of tin lost during gravity processing and especially during flotation. 

Since the biogeochemical model PROFILE includes such important characteristics as mineral abundance, another model UPPSALA has been created that allows the researcher to calculate the soil mineralogical composition on the basis of total element content. The combination of these models (PROFILE and UPPSALA) gives the possibility to use existing soil and ecosystem databases for calculating critical loads of acidity in broad-scale regions. 

Predicted mineralogical composition of average Tianqi porcelain body ... 

By dividing each eigenvector component by the smallest of them, we find that the components of the fourth eigenvector [0.1826, 0.3651, 0.5477, 0.7303]T associated with the smallest eigenvalue (here zero) are in proportion of (1, 2, 3, 4) which is precisely the source composition used to produce the synthetic data (Table 9.3). The capability of this formalism to invert the data to produce relative source concentrations is therefore established. It is left to the reader to show that correct source mineralogical compositions can be retrieved using the procedure outlined in Section 9.2.2. <=... 

S> determination of bulk mineralogical composition by summation over all spots. 

D. W. Allen, C.C. Britt, D.T. (2000) Mineralogy, composition, and alteration of Mars Pathfinder rocks and sods Evidence from multispectral, elemental, and magnetic data on terrestrial analogue, SNC meteorite, and Pathfinder samples. J. Geophys. Res. 105 1757-1817... 

The form of nickel in particles from different industries varies. The mineralogical composition, chemical content, and form of dusts from nine industries in Cracow, Poland, were examined (Rybicka 1989). The chemical form of a particle-associated heavy metal that was assessed by a five-step extraction scheme classified the metal as exchangeable, easily reducible (manganese oxides, partly amorphous iron oxyhydrates and carbonates), moderately reducible (amorphous and poorly crystallized iron oxyhydrates), organically bound or sulfidic, and residual. Dusts from power plants had a silicate characteristic with quartz and mullite predominant. Approximately 90% of the nickel from these... 

Because the basis for mineral beneficiation is the physical separation of particles of different mineralogical composition, the success of such a particle separation as a means of separating one type of mineral from another depends on two prerequisites ... 

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