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Hydrogen plays an extremely important role in the structure and chemistry of the oxide and oxysalt minerals. The characteristics of this role can be profitably analyzed in a simple and intuitive fashion using bond-valence theory. For any crystal structure, the  structural unit  may be defined as the strongly bonded part of the structure; structural units are linked together by  interstitial species , usually alkali or alkaline earth cations and (H 2 O) 0  groups that are involved in much weaker bonding. This scheme gives a  binary representation  of even the most complex structure. The interaction between the structural unit and the interstitial species can be quantitatively evaluated using the  valence-matching principle  (Brown, 1981).

The role of OH and H 2 O in oxide and oxysalt minerals