By A. S. Povarennykh
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Extra resources for Crystal Chemical Classification of Minerals
For fluorides this is Li, Na, Ca, Sr, B, AI, Y, and Ce, for chlorides it is Na, K, Cu, Ag, Mg, Ca, Pb, and Fe, for arsenides it is Cu, Fe, Co, Ni, Pd, Pt, and for tellurides it is Ag, Au, Hg, Pb, Bi, and NL These characteristic associations (parageneses) of species-forming elements arise in the crust not only on account of aspects of the migration of the elements but also because the compounds undergo selection in accordance with the principle of maximum stability. , always having the same ratio of species-forming elements in its structure) or of variable composition (wide variation in the ratio by isomorphous substitution).
The anisodesmicity factor A = a max / a min gives us the following scheme for the classification of minerals: 1) isodesmic (A of 1-3); 2) slightly anisodesmic (A of 3-8); 3) moderately anisodesmic (A of 8-20); 4) stronglyanisodesmic (A of 20-50); and 5) very strongly anisodesmic (A> 50). Mineral compositions vary very widely, and the isodesmic compounds include not only complex oxides but also certain silicates, such as phenakite Be2Si04 and disthene AI 2[Si0 4)O. Similarly, the Slightly anisodesmic compounds include many complex oxides and silicates, as well as some vanadates, phosphates, and borates (Povarennykh, 1963 [109)).
The factors that determine the CN of atoms are actually the same as for structures, since they are the basis of any structure. The main factor determining CN is the strength of the bond to the surrounding atoms; CN is inversely related to this. The bond strength is governed by the interatomic distance d, the valency W, and the degree of covalency C. For the case of unit valency of cation and anion, we may put as relating CN to the other quantities the equation CN= d/C. (I) BASIC LAWS OF THE CRYSTAL UIELllSTRY OF I\HNERALS 35 The curves (Fig.