Iowaite
Allmann R, Donnay J D H
American Mineralogist 54 (1969) 296-299
About the structure of iowaite
_database_code_amcsd 0000189
3.119 3.119 24.52 90 90 120 R-3m
atom x y    z occ
Mg   0 0    0 .8
Fe   0 0    0 .2
OH1  0 0 .376
OH2  0 0   .5 .6
Cl   0 0   .5 .2