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 = 1.04, Synthesis at P=200 MPa, T=500 C _database_code_amcsd 0003591 8.8596 5.6834 10.1679 90 115.503 90 P2_1/m atom x y z occ Ca1 .757 3/4 .152 Ca2 .596 3/4 .423 AlM1 0 0 0 .84 MnM1 0 0 0 .16 AlM2 0 0 1/2 .95 MnM2 0 0 1/2 .05 AlM3 .300 .25 .221 .17 MnM3 .300 .25 .221 .83 Si1 .335 3/4 .043 Si2 .688 .25 .274 Si3 .187 3/4 .321 O1 .237 .984 .031 O2 .311 .981 .355 O3 .793 .017 .336 O4 .062 .25 .134 O5 .043 3/4 .148 O6 .070 3/4 .413 O7 .512 3/4 .180 O8 .524 .25 .310 O9 .614 .25 .093 OH10 .086 .25 .424