Eucryptite
Pillars W W, Peacor D R
American Mineralogist 58 (1973) 681-690
The crystal structure of beta eucryptite as a function of temperature
T = 440 C
_database_code_amcsd 0000379
10.501 10.501 11.194 90 90 120 P6_422
atom     x     y     z Biso
Si1  .2497     0     0  .66
Si2  .2483 .4966     0  .73
Al1  .2523     0   1/2  .87
Al2    .25    .5   1/2  .81
Li1      0     0   1/2  6.6
Li2    1/2     0     0  2.9
Li3    1/2     0  .324  3.6
O1   .0877 .1942 .2451 1.01
O2   .6033 .7020 .2666  .96
O3   .1054 .7089 .2560 2.82
O4   .5927 .2067 .2497 1.84