Mullite
Fischer R X, Schmucker M, Angerer P, Schneider H
American Mineralogist 86 (2001) 1513-1518
Crystal structures of Na and K aluminate mullites
Sample: Na
_database_code_amcsd 0002749
7.6819 7.6810 2.91842 90 90 90 Pbam
atom     x     y   z   occ Biso
Na    .087  .561 1/2 .1675  1.4
Al1      0     0   0        .79
AlT  .1510 .3331 1/2 .6675  .83
AlT* .2691 .1956 1/2 .3325  1.1
Oab  .3602 .4211 1/2       1.31
Oc*  .4843 .0458 1/2 .3325  1.1
Od   .1318 .2124   0        1.2