Summary: American Mineralogist, Volume 94, pages 12051215, 2009
0003-004X/09/08091205$05.00/DOI: 10.2138/am.2009.3177 1205
Simultaneous aluminum, silicon, and sodium coordination changes in 6 GPa sodium
KIMBERLY E. KELSEY,1,
* JONATHAN F. STEBBINS,1
JED L. MOSENFELDER,2
AND PAUL D. ASIMOW2
Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115, U.S.A.
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, U.S.A.
We present the first direct observation of high-coordinated Si and Al occurring together in a series
of high-pressure sodium aluminosilicate glasses, quenched from melts at 6 GPa. Using29
Si MAS NMR,
we observe that a small amount of Al does not have a significant effect on the amount of V
Si or VI
generated, but that largerAl concentrations lead to a gradual decrease in both these species. 27