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=350 MPa, T=500 C
_database_code_amcsd 0003590
8.8490 5.6670 10.153 90 115.499 90 P2_1/m
atom     x    y    z occ
Ca1   .756  3/4 .152
Ca2   .599  3/4 .424
AlM1     0    0    0 .80
MnM1     0    0    0 .20
AlM2     0    0  1/2
AlM3  .297  .25 .222 .20
MnM3  .297  .25 .222 .80
Si1   .335  3/4 .043
Si2   .685  .25 .274
Si3   .187  3/4 .318
O1    .233 .986 .030
O2    .308 .975 .353
O3    .795 .019 .338
O4    .064  .25 .136
O5    .043  3/4 .147
O6    .066  3/4 .407
O7    .514  3/4 .181
O8    .524  .25 .310
O9    .617  .25 .094
OH10  .080  .25 .424