Recently new NH4- and Mg-containing minerals of the voltaite group have been discovered. As they were found in minute amounts and are intimately intergrown with their associated minerals, a number of their properties could not be measured and characterized properly. The four pure end members of the solid solution series were synthesized and characterized, that made possible the reliable identification of natural solid solutions within the boundaries of this phase composition range
Key words: Inorganic frameworks, experimental mineralogy, mixed valence solids
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