Bassanite Ballirano P, Maras A, Meloni S, Caminiti R European Journal of Mineralogy 13 (2001) 985-993 The monoclinic I2 structure of bassanite, calcium sulphate hemihydrate _database_code_amcsd 0006909 12.0350 6.9294 12.6705 90 90.266 90 I2 atom x y z Biso Ca1 0 .5 0 .91 Ca2 .5 .011 0 .91 Ca3 .2380 .199 .1677 .91 Ca4 .2217 .165 .6648 .91 S1 -.0016 .499 .2493 .75 S2 .2247 .164 .9183 .75 S3 .2282 .185 .4146 .75 O1 .127 .211 .984 .90 O2 .125 .230 .473 .90 O3 .074 .616 .315 .90 O4 .075 .620 .816 .90 O5 .196 .044 .332 .90 O6 .205 -.015 .858 .90 O7 .057 .366 .178 .90 O8 .058 .376 .673 .90 O9 .272 .359 .361 .90 O10 .238 .317 .838 .90 O11 .319 .161 .991 .90 O12 .308 .103 .491 .90 Wat1 0 .843 0 6.4 Wat2 .953 .004 .353 6.4