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 = 0.75, p = 0.75, Synthesis at P=350 MPa, T=500 C
_database_code_amcsd 0003588
8.8548 5.6541 10.1546 90 115.514 90 P2_1/m
atom     x    y    z occ
Ca1   .756  3/4 .154
Ca2   .600  3/4 .424
AlM1     0    0    0 .87
MnM1     0    0    0 .13
AlM2     0    0  1/2 .97
MnM2     0    0  1/2 .03
AlM3  .298  .25 .222 .42
MnM3  .298  .25 .222 .58
Si1   .337  3/4 .045
Si2   .685  .25 .275
Si3   .188  3/4 .319
O1    .231 .990 .034
O2    .308 .979 .358
O3    .794 .017 .342
O4    .059  .25 .133
O5    .044  3/4 .149
O6    .065  3/4 .405
O7    .515  3/4 .173
O8    .520  .25 .302
O9    .619  .25 .097
OH10  .089  .25 .426