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 = 1.03, Synthesis at P=350 MPa, T=500 C _database_code_amcsd 0003592 8.860 5.6818 10.167 90 115.511 90 P2_1/m atom x y z occ Ca1 .757 3/4 .152 Ca2 .598 3/4 .424 AlM1 0 0 0 .81 MnM1 0 0 0 .19 AlM2 0 0 1/2 .99 MnM2 0 0 1/2 .01 AlM3 .299 .25 .222 .17 MnM3 .299 .25 .222 .83 Si1 .334 3/4 .042 Si2 .686 .25 .274 Si3 .188 3/4 .320 O1 .238 .986 .031 O2 .310 .981 .358 O3 .792 .022 .335 O4 .063 .25 .131 O5 .046 3/4 .151 O6 .070 3/4 .411 O7 .511 3/4 .182 O8 .523 .25 .306 O9 .610 .25 .090 OH10 .086 .25 .420