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