Sewardite
Roberts A C, Cooper M A, Hawthorne F C, Criddle A J, Stirling J A R
The Canadian Mineralogist 40 (2002) 1191-1198
Sewardite, CaFe2(AsO4)2(OH)2, the Ca-analogue of carminite,
from Tsumeb, Namibia: Description and crystal structure
Locality: Tsumeb, Namibia
_database_code_amcsd 0005788
16.461 7.434 12.131 90 90 90 Cccm
atom      x      y      z  Uiso
Ca1       0      0    1/4 .0185
Ca2     1/4    3/4      0 .0101
Fe   .37896  .1321 .13404 .0056
As1  .04504  .7447      0 .0054
As2  .21374      0    1/4 .0048
O1    .0144  .2246  .1119  .005
O2    .0885   .529      0  .006
O3    .1219  -.114      0  .012
O4    .1511  .1777  .2389  .011
O5    .2720 -.0150  .1378  .005
OH6   .1711   .233      0  .005
OH7   .4243      0    1/4  .017