Talmessite
Catti M, Ferraris G, Ivaldi G
Bulletin de Mineralogie 100 (1977) 230-236
Hydrogen bonding in the crystalline state. Structure of talmessite,
Ca2(Mg,Co)(AsO4)2*2H2O, and crystal chemistry of related minerals
Locality: Bou-Azzer, Morocco
_database_code_amcsd 0012065
5.874 6.943 5.537 97.3 108.7 108.1 P-1
atom     x     y     z occ  B(1,1)  B(2,2)  B(3,3)  B(1,2)   B(1,3)   B(2,3)
Ca   .2949 .7622 .6529     .007042 .007783 .007472 .004324  .004104 -.001003
Mg       0     0     0 .65 .010234 .010786 .012809 .005462  .003532 -.001697
Co       0     0     0 .35 .010234 .010786 .012809 .005462  .003532 -.001697
As   .3341 .2460 .6703     .001972 .003984 .003008 .000986  .000955 -.001465
O1   .3420 .1272 .9217     .009577 .008703 .010577 .004476  .005345  .002545
O2   .2385 .0504 .3986     .008356 .009070 .007084 .005310 -.000955 -.004936
O3   .1550 .3916 .6412     .009953 .005516 .013876 .004779  .004677  .000771
O4   .6395 .3864 .7149     .008450 .008641 .014750 .001214  .007159 -.002236
Wat  .9533 .2778 .0745     .006572 .006619 .003881 .003414  .002959 -.000154