Sursassite
Gottschalk M, Fockenberg T, Grevel K-D, Wunder B, Wirth R, Schreyer W, Maresch W V
European Journal of Mineralogy 12 (2000) 935-945
Crystal structure of the high-pressure phase Mg4(MgAl)Al4[Si6O21/(OH)7]:
an analogue of sursassite
Sample: A53
_database_code_amcsd 0006842
8.5424 5.7117 9.6484 90 108.298 90 P2_1/m
atom     x    y     z occ  Uiso
MgM1 .1804  1/4 .3154      .005
MgM2 .2765  1/4 .6718      .006
AlM3   1/2    0   1/2 .58  .018
MgM3   1/2    0   1/2 .42  .018
AlM4   1/2    0     0      .005
AlM5     0    0     0      .004
SiT1 .3060  3/4 .1948     .0112
SiT2 .2068  3/4 .8067     .0112
SiT3 .1492  3/4 .4930     .0112
O1    .251 .508  .498     .0054
O2   .1898 .522 .1707     .0054
O3   .3160 .514 .8243     .0054
O4    .407  3/4 .0765     .0054
O5    .457  3/4 .3586     .0054
O6    .089  1/4 .9279     .0054
O7    .442  1/4 .3632     .0054
O8    .080  3/4 .8997     .0054
O9    .076  3/4 .6357     .0054
O10  -.026  3/4 .3549     .0054
O11   .402  1/4 .0663     .0054
H1    .145  1/4  .034       .01
H2    .361  1/4  .263 .42   .01
H3   -.107  3/4  .257       .01
H4    .480  1/4  .166       .01