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