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 = 0.75, p = 0.75, Synthesis at P=350 MPa, T=500 C _database_code_amcsd 0003588 8.8548 5.6541 10.1546 90 115.514 90 P2_1/m atom x y z occ Ca1 .756 3/4 .154 Ca2 .600 3/4 .424 AlM1 0 0 0 .87 MnM1 0 0 0 .13 AlM2 0 0 1/2 .97 MnM2 0 0 1/2 .03 AlM3 .298 .25 .222 .42 MnM3 .298 .25 .222 .58 Si1 .337 3/4 .045 Si2 .685 .25 .275 Si3 .188 3/4 .319 O1 .231 .990 .034 O2 .308 .979 .358 O3 .794 .017 .342 O4 .059 .25 .133 O5 .044 3/4 .149 O6 .065 3/4 .405 O7 .515 3/4 .173 O8 .520 .25 .302 O9 .619 .25 .097 OH10 .089 .25 .426