Crystal chemical classification

Crystal chemistry ofTa and Nb fluorides - Crystal-chemical classification... 

This monograph compiles the latest research on the chemistry of complex fluorides and oxyfluorides of tantalum and niobium, and covers synthesis and fluorination processes, crystal structure peculiarities and crystal chemical classification, as well as the behavior of complex ions in fluorine solutions and melts. 

A.M. Gaudin Memorial Volume, M. C. Fuerstenau (ed.), AIME, 1 334 - 363 Povarennyk, A. S., 1972. Crystal Chemical Classification of Minerals (two vols.). New York Plenum Press... 

Povarennykh, A. S. 1972. Crystal Chemical Classification of Minerals. Plenum Press, New York. 

The basis of the crystal chemical classification of tantalum and niobium fluoride compounds was first formulated by Kuznetzov and Rogachov [232], The main tenets of the classification are as follows ... 

Crustal chemistry of Tit and h h jtuorides - Crystal-chemical classification 123... 

In 1970, Heller suggested a classification of borates based on the number of boron atoms in the fundamental building block . In 1971, J. R. Clark added, in an article on crystal chemistry of borates , a further principle as the fifth rule, namely that "the boric acid group, B(OH)3, may exist in isolated form in the presence of more complex polyanions, or such insular groups may themselves polymerize and attach to side-chains of more complex polyanions , as first observed in the crystal structures of veatchite and paraveatchite. In 1977, Christ and Clark reviewed the various principles and classifications in their article on a crystal-chemical classification of borate structures with emphasis on hydrated borates . In addition to a sixth rule. 

Christ, C. L., and J. R. Clark (1977). A crystal-chemical classification of borate structures with emphasis on hydrated borates. Phys. Chem. Minerals 2, 59-88. 

Crystal chemical systematics allows the presentation of the structural data in a most compact form. The majority of the crystal chemical classifications of the silicates is bas on the analysis of the Si,0 complexes [Sin,On]. The average number of 0, rper one tetrahedron is K = 8 - 2-(n/m). The value of the average negative charge per tetrahedron controls the shape of the Si,0 - complex. 

The crystal-chemical classification used in this chapter will help in the recognition of similarities among the many minerals that have been described, and new minerals may fill in some of... 

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