ORDERING BEHAVIOR OF ALBITE IN AQUEOUS-SOLUTIONS AT 1-KBAR

Albite crystallized hydrothermally from gels of Ab100 and Ab90 (SiO2)10 (wt %) composition changes in degree of Al, Si order with time to reach a steady value. The steady values are influenced by fluid and gel composition as well as temperature. Albites grown in long experiments in the presence of NaOH and excess SiO2 are more ordered than albites grown in similar experiments with pure water and excess SiO2. This 'catalytic' effect declines as temperature is increased above 600 ° C. Partially ordered albites heated hydrothermally at 700 ° and 725 ° C decrease in degree of order. When heated at 600 °, 650 ° or 675 ° C the degree of order either increases very slightly, or remains the same depending on the degree of order initially present. © 1979 Springer-Verlag.