By J. Lima-De-Faria (auth.)
This paintings offers a unique pure structural category of minerals, in line with the minerals' inner constitution. in additional element, it truly is in line with the energy distribution and directional personality of the bonds.
This new type might be regarded as an extension of the structural type of silicates, to the entire area of minerals.
a whole and good geared up assessment of 230 mineral constitution varieties comprizing the extra universal minerals is gifted in chart shape. at the charts, the crystal buildings are offered in a few complementary methods resembling in projection, shut packing, coordinated polyhedra and layer description.
This paintings is of specific curiosity to lecturers and examine staff in crystallography, mineralogy and inorganic crystal chemistry in academia.
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Additional resources for Structural Mineralogy: An Introduction
1. Rules governing the polyhedral constitution of inorganic crystal structures (Pauling rules) One of the ways to look at structures is to consider the coordination polyhedra formed by the anions around the cations, and how they are linked to each other. Pauling (1929) has proposed five rules for ionic structures, which govern the linkage of these polyhedra (whether linked by corners, edges or faces), in order to determine the possible stable structures. 35 First rule: A coordination polyhedra of anions is formed about each cation, the cation-anion distance equalling the sum of their characteristic packing radii and their radius ratio determining both the nature of the coordination polyhedron and, therefore, the coordination number of the cation.
There is consequently a definite relation between structure and habit, though there are often obscure additional factors, such as the conditions of formation, which may play an important role. The kind of structural units seems to be the main factor. In sheet structures the habit is normally platy or leafy, in chain structures it is prismatic or acicular, and in close-packed, group and framework structures it is generally isometric, that is, the crystal develops more or less equally in all directions.
1.. ),';- v 14-vertex Frank-Kasper polyhedron " (. ->-:/ . :--,. " ;''''''0 121 (~ .. <~ "~':~;. ' o monocapped, square anti prism 12aco '·=" " ,. . -----::::0 15-vertex Frank,Kasper polyhedron 9--::-C :. : ,... ~ ... -; .. ~ ........... ~ ... hexagonal prism ~':~''-'_~~'':'':) ... ,' \ IS-vertex Frank,Kasper polyhedron Fig. 8. More commonly occurring coordination polyhedra in inorganic structures (after Parth6, 1990). 19 Table 9. Limiting radii for the various coordinated configurations.
Structural Mineralogy: An Introduction by J. Lima-De-Faria (auth.)