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=200 MPa, T=500 C _database_code_amcsd 0003587 8.8530 5.6596 10.1501 90 115.511 90 P2_1/m atom x y z occ Ca1 .756 3/4 .153 Ca2 .603 3/4 .424 AlM1 0 0 0 .92 MnM1 0 0 0 .08 AlM2 0 0 1/2 .98 MnM2 0 0 1/2 .02 AlM3 .295 .25 .223 .35 MnM3 .295 .25 .223 .65 Si1 .337 3/4 .045 Si2 .681 .25 .275 Si3 .186 3/4 .320 O1 .235 .989 .034 O2 .305 .980 .355 O3 .794 .017 .343 O4 .064 .25 .132 O5 .042 3/4 .148 O6 .068 3/4 .406 O7 .517 3/4 .181 O8 .522 .25 .309 O9 .621 .25 .095 OH10 .080 .25 .424