Tamarugite
Robinson P D, Fang J H
American Mineralogist 54 (1969) 19-30
Crystal structures and mineral chemistry of double-salt hydrates: I. Direct
determination of the crystal structure of tamarugite
7.353 25.225 6.097 90 95.2 90 P2_1/a
atom     x     y     z Biso
Na   .6169 .0525 .1950  1.8
Al   .1424 .1454 .6785   .9
S1   .6427 .1830 .2097  1.2
S2   .7076 .0204 .7515  1.2
O1   .5594 .2214 .0424  1.9
O2   .8171 .1621 .1392  1.9
O3   .5159 .1391 .2373  2.3
O4   .6811 .2112 .4229  1.8
O5   .2929 .0400 .2612  2.0
O6   .7571 .0421 .5380  2.1
O7   .5208 .0381 .7938  1.5
O8   .8391 .0384 .9326  1.5
Wat1 .1232 .1870 .4182  1.5
Wat2 .0611 .0881 .4987  1.8
Wat3 .3837 .1260 .6365  1.5
Wat4 .9020 .1636 .7299  1.4
Wat5 .2358 .2020 .8446  1.9
Wat6 .1389 .1000 .9307  2.4