6O10O8/2. The corresponding molecules in solution are hydrated six-linked ring molecules Si6O6(OH)12. 2) A group of five ring molecules in crystals, four surrounding one and all sharing one O atom with the central one, become a big derived tetrahedra molecule that occupies the height of three unit cells. Ordered or disordered ring, ribbon or sheat molecules in solution are convenient material for the crystallization of both the six-linked ring molecule or big tetrahedra molecules in crystals involving more or less "breaking" of Si-O bonds.3) During the course of cooling of the hydrothermal solution the amount of colloidal particles in total volume should certainly be increased at the expense of the molecules in state of true solution, for the smaller molecules' polymererization may continue several steps further. On the contrary, when the hydrothermal condition is building or rebuilding up, the statistical equilibrium size of the molecular aggregates is determined at the compromise of temperature and pressure.4) When the crystal begins to dissolve, the material passing into solution is mostly segregated in domains, their further dispersion resulted in hydrated molecules of different sizes and forms. On the contrary, during crystallization the process of convertion of the molecules is mainly the loss of (OH) and sharing of O.It is reasonable to assume the existance of transitional boundary layers surrounding the crystals that are growing as well as that are subjected to solvation."/>     HYDROTHERMAL CRYSTALLIZATION AND DISSOLUTION OF QUARTZ
Acta Physica Sinica
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Acta Phys. Sin.  1965, Vol. 21 Issue (2): 329-345    
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HYDROTHERMAL CRYSTALLIZATION AND DISSOLUTION OF QUARTZ
CHANG YUAN-LUNG, CHANG HUI-FEN
中国科学院
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