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 = 1.25, Synthesis at P=350 MPa, T=500 C
_database_code_amcsd 0003594
8.8625 5.7006 10.1822 90 115.525 90 P2_1/m
atom     x    y    z occ
Ca1   .756  3/4 .151
Ca2   .594  3/4 .420
AlM1     0    0    0 .68
MnM1     0    0    0 .32
AlM2     0    0  1/2 .95
MnM2     0    0  1/2 .05
AlM3  .306  .25 .222 .11
MnM3  .306  .25 .222 .89
Si1   .333  3/4 .040
Si2   .690  .25 .271
Si3   .184  3/4 .321
O1    .238 .980 .029
O2    .312 .978 .350
O3    .796 .017 .333
O4    .067  .25 .142
O5    .039  3/4 .154
O6    .079  3/4 .420
O7    .515  3/4 .184
O8    .531  .25 .308
O9    .610  .25 .088
OH10  .088  .25 .418