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 = 200 C
_database_code_amcsd 0000377
10.499 10.499 11.197 90 90 120 P6_422
atom     x     y     z Biso
Si1  .2499     0     0  .37
Si2  .2476 .4952     0  .55
Al1  .2532     0   1/2  .49
Al2  .2499 .4998   1/2  .64
Li1      0     0   1/2  1.7
Li2    1/2     0     0  6.1
Li3    1/2     0  .324  1.8
O1   .0860 .1947 .2435  .99
O2   .6038 .7006 .2655  .81
O3   .1067 .7106 .2572 1.84
O4   .5906 .2017 .2499 1.10