Piemontite
Nagashima M, Akasaka M
American Mineralogist 89 (2004) 1119-1129
An X-ray Rietveld study of piemontite on the join
Ca2Al3Si3O12(OH) - Ca2Mn3+3Si3O12(OH) formed by hydrothermal synthesis
Sample: q = 1.75, p = 1.26, Synthesis at P=200 MPa, T=500 C
_database_code_amcsd 0003595
8.8591 5.7039 10.1827 90 115.548 90 P2_1/m
atom     x    y    z occ
Ca1   .756  3/4 .154
Ca2   .596  3/4 .423
AlM1     0    0    0 .69
MnM1     0    0    0 .31
AlM2     0    0  1/2 .98
MnM2     0    0  1/2 .02
AlM3  .301  .25 .224 .08
MnM3  .301  .25 .224 .92
Si1   .338  3/4 .041
Si2   .686  .25 .276
Si3   .186  3/4 .321
O1    .236 .979 .030
O2    .313 .973 .356
O3    .794 .019 .332
O4    .069  .25 .135
O5    .038  3/4 .147
O6    .079  3/4 .417
O7    .528  3/4 .188
O8    .533  .25 .309
O9    .612  .25 .095
OH10  .083  .25 .415