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 = 1.5, p = 1.26, Synthesis at P=200 MPa, T=500 C
_database_code_amcsd 0003593
8.8589 5.7017 10.1802 90 115.540 90 P2_1/m
atom     x    y    z occ
Ca1   .756  3/4 .152
Ca2   .595  3/4 .421
AlM1     0    0    0 .73
MnM1     0    0    0 .27
AlM2     0    0  1/2 .95
MnM2     0    0  1/2 .05
AlM3  .304  .25 .222 .06
MnM3  .304  .25 .222 .94
Si1   .338  3/4 .040
Si2   .687  .25 .272
Si3   .186  3/4 .320
O1    .237 .982 .028
O2    .313 .978 .352
O3    .795 .019 .334
O4    .062  .25 .140
O5    .044  3/4 .151
O6    .077  3/4 .414
O7    .514  3/4 .185
O8    .530  .25 .312
O9    .606  .25 .091
OH10  .085  .25 .421