By J. A. Tossell (auth.), Frank J. Berry, David J. Vaughan (eds.)

In contemporary years mineralogy has built even more desirable hyperlinks with solid-state chemistry and physics and those advancements were followed via a development in the direction of extra quantification within the theoretical in addition to the experimental elements of the topic. the significance of solid-state chemistry to mineralogy was once mirrored in a symposium held on the 1982 Annual Congress of The Royal Society of Chemistry at which the unique types of lots of the contributions to this booklet have been offered. The assembly introduced jointly chemists, geologists and mineralogists all of whom have been attracted to the appliance of recent spectroscopic concepts to the examine of bonding in minerals. The interdisci­ plinary nature of the symposium enabled a worthwhile alternate of data from a few of the fields and it used to be felt booklet offering stories of the major components of the topic will be an invaluable addition to either the chemical and mineralogical literature. the sector of analysis that is regularly termed the 'physics and chemistry of minerals' has itself built very swiftly over contemporary years. Such swift improvement has ended in many chemists, geologists, geochemists and mineralogists being much less popular than they may want with the strategies at the moment to be had. valuable to this box is an knowing of chemical bonding or 'electronic constitution' in minerals which has been constructed either theoretically and by means of spectroscopic techniques.

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A13p orbitals interact with the 2p (J' oxygen orbital that forms the bond to hydrogen in hydroxyl, and also with the 2p 11: lone pair oxygen orbitals that are about 4 eV less tightly bound. Aluminium 3p character enters both these energy levels and a split AIKj1 results, the relative intensities of two component peaks (1(1548eV): ~ 2(1552eV)) measuring the total amount of A13p character in each level. The spectra for the oxy-hydroxides are remarkably different, both from each other and from gibbsite.

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Such sequential bond breaking can be followed through a series of materials such as ZnS -+ GaSe -+ As -+ Se, Te -+ 12 -+ Xe. 14). Bond distance and angle trends may also sometimes be understood using similar types of perturbation MO theory as Vaughan will discuss for sulphides and arsenides in his chapter. We have also been able to use qualitative theory to interpret some of our computational results. g. g. CUI vs ZnIl as in Fig. 12). g. g. g. g. g. g. g. olivines M 2 Si0 4 (M mixture Mg, Fe, Mn) 24 Chemical Bonding and Spectroscopy in Mineral Chemistry Lp 10 Md I_ S- ILl I Au Cu Ag 14 CI16 0- 18 20 nonrel.

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