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 = 1.1, p = 1.03, Synthesis at P=350 MPa, T=500 C
_database_code_amcsd 0003592
8.860 5.6818 10.167 90 115.511 90 P2_1/m
atom     x    y    z occ
Ca1   .757  3/4 .152
Ca2   .598  3/4 .424
AlM1     0    0    0 .81
MnM1     0    0    0 .19
AlM2     0    0  1/2 .99
MnM2     0    0  1/2 .01
AlM3  .299  .25 .222 .17
MnM3  .299  .25 .222 .83
Si1   .334  3/4 .042
Si2   .686  .25 .274
Si3   .188  3/4 .320
O1    .238 .986 .031
O2    .310 .981 .358
O3    .792 .022 .335
O4    .063  .25 .131
O5    .046  3/4 .151
O6    .070  3/4 .411
O7    .511  3/4 .182
O8    .523  .25 .306
O9    .610  .25 .090
OH10  .086  .25 .420