By David J. Vaughan
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The excessive variety of deadly injuries within the mining makes mine safeguard a big factor in the course of the international. the hazards to lifestyles are frequent, starting from dirt explosions and the cave in of mine stopes to flooding and basic mechanical mistakes. Mine defense combines specific details on defense in mining with equipment and arithmetic that may be used to maintain human lifestyles.
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Extra info for Sulfide Mineralogy and Geochemistry (Reviews in Mineralogy and Geochemistry 61)
It is a low-energy process and it is reversible, a subject of “soft chemistry” of practical Crystal Structures of Sulfides & Chalcogenides 29 Table 9. Selected dichalcogenides with layer structures. Formula Space group Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Synth. Molybdenite 3R Molybdenite 2H Drysdallite 2H Synth. * Synth. Synth. Synth. 2TaS2 FeMo2S4 LiMoS2 Synth. Berndtite 4H Berndtite 2T Synth.
Interstitial, corner-sharing tetrahedra: ball-and-stick representation, Cu grey, Fe black. (d) A layer of the crystal structure of mooihoekite with chains  of Fe-centered octahedral metal clusters. Dark cations: Fe, light cations: Cu. Crystal Structures of Sulfides & Chalcogenides 49 Figure. 23. The structure of haycockite Cu4Fe5S8 (Rowland and Hall 1975). Fe: dark atoms and allgrey tetrahedra; Cu: light cations and light tetrahedra. Solid tetrahedra represent groups of edge-sharing tetrahedra (octahedral metal clusters).
A lot of literature deals with the models for long-period polytypes. The ANNNI model, for example (Angel et al. 1985), and others have been summarized by Baronnet (1997). However, when amalgamated, the ZnS polytypes listed here amount to a fairly random incidence of combinations of two different or equal layer-stack thicknesses which, whenever they happen to satisfy a particular multiplicity ratio, produce a certain type of space group symmetry. There might be a human factor enhancing the frequency of observation of the first two categories from the above list in comparison to the last one, for which the structure determination is more difficult.