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 = 1.0, p = 1.00, Synthesis at P=200 MPa, T=500 C
_database_code_amcsd 0003589
8.8531 5.6741 10.1613 90 115.519 90 P2_1/m
atom     x    y    z occ
Ca1   .756  3/4 .156
Ca2   .601  3/4 .424
AlM1     0    0    0 .86
MnM1     0    0    0 .14
AlM2     0    0  1/2 .95
MnM2     0    0  1/2 .05
AlM3  .300  .25 .221 .19
MnM3  .300  .25 .221 .81
Si1   .335  3/4 .046
Si2   .687  .25 .274
Si3   .184  3/4 .321
O1    .236 .982 .033
O2    .310 .974 .359
O3    .794 .018 .336
O4    .061  .25 .133
O5    .038  3/4 .151
O6    .070  3/4 .407
O7    .519  3/4 .189
O8    .526  .25 .308
O9    .615  .25 .097
OH10  .081  .25 .420