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 = 0.5, p = 0.5, Synthesis at P=350 MPa, T=500 C _database_code_amcsd 0003586 8.856 5.6291 10.148 90 115.516 90 P2_1/m atom x y z occ Ca1 .757 3/4 .155 Ca2 .603 3/4 .421 AlM1 0 0 0 .99 MnM1 0 0 0 .01 AlM2 0 0 1/2 .96 AlM2 0 0 1/2 .04 AlM3 .298 .25 .222 .55 MnM3 .298 .25 .222 .45 Si1 .332 3/4 .046 Si2 .682 .25 .275 Si3 .186 3/4 .317 O1 .232 .991 .036 O2 .301 .986 .358 O3 .789 .013 .352 O4 .065 .25 .135 O5 .042 3/4 .147 O6 .063 3/4 .399 O7 .521 3/4 .181 O8 .521 .25 .303 O9 .632 .25 .095 OH10 .075 .25 .424