Cahnite
Prewitt C T, Buerger M J
American Mineralogist 46 (1961) 1077-1085
The crystal structure of cahnite, Ca2BAsO4(OH)4
Locality: Franklin, New Jersey, USA
_database_code_amcsd 0000097
7.11 7.11 6.20 90 90 90 I-4
atom    x    y    z
As      0    0    0
B       0   .5  .25
Ca1     0    0   .5
Ca2     0   .5  .75
O1   .178 .054 .167
OH2  .160 .444 .114