Poldervaartite
Dai Y S, Harlow G E, McGhie A R
American Mineralogist 78 (1993) 1082-1087
Poldervaartite, Ca(Ca0.5Mn0.5)(SiO3OH)(OH), a new acid nesosilicate from the
Kalahari manganese field, South Africa: Crystal structure and description
_database_code_amcsd 0001615
9.398 9.139 10.535 90 90 90 Pbca
atom       x      y      z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Ca1   .15406 .49326 .39021           .0090  .0101  .0084 -.0004  .0007  .0003
Ca2   .51266 .33390 .43048 .67       .0101  .0104  .0098 -.0022 -.0003 -.0004
Mn    .51266 .33390 .43048 .33       .0101  .0104  .0098 -.0022 -.0003 -.0004
Si    .32973 .21515 .65939           .0076  .0075  .0069  .0002 -.0002 -.0004
Oh1    .2518  .3502  .5735            .028  .0104  .0140  .0046 -.0084 -.0005
O2    -.0559  .3590  .4368           .0092  .0145  .0117 -.0019 -.0002 -.0042
O3     .1020  .7101  .2829           .0160  .0134  .0087  .0022  .0045  .0043
Oh4    .3965  .5492  .3980           .0118   .019   .016 -.0012 -.0002  .0063
O5     .2019  .3986  .1893           .0146  .0145  .0129  .0044  .0018 -.0016
H1      .257   .074   .117      .03
H2     -.084   .588   .173      .03