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 _database_code_amcsd 0000186 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