data_global
_chemical_name_mineral 'Piemontite'
loop_
_publ_author_name
'Nagashima M'
'Akasaka M'
_journal_name_full 'American Mineralogist'
_journal_volume 89 
_journal_year 2004
_journal_page_first 1119
_journal_page_last 1129
_publ_section_title
;
 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
_chemical_formula_sum 'Ca2 Al2.54 Mn.46 Si3 O13 H'
_cell_length_a 8.856
_cell_length_b 5.6291
_cell_length_c 10.148
_cell_angle_alpha 90
_cell_angle_beta 115.516
_cell_angle_gamma 90
_cell_volume 456.549
_exptl_crystal_density_diffrn      3.399
_symmetry_space_group_name_H-M 'P 1 21/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,z'
  '-x,1/2+y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Ca1   0.75700   0.75000   0.15500   1.00000
Ca2   0.60300   0.75000   0.42100   1.00000
AlM1   0.00000   0.00000   0.00000   0.99000
MnM1   0.00000   0.00000   0.00000   0.01000
AlM2   0.00000   0.00000   0.50000   0.96000
AlM2   0.00000   0.00000   0.50000   0.04000
AlM3   0.29800   0.25000   0.22200   0.55000
MnM3   0.29800   0.25000   0.22200   0.45000
Si1   0.33200   0.75000   0.04600   1.00000
Si2   0.68200   0.25000   0.27500   1.00000
Si3   0.18600   0.75000   0.31700   1.00000
O1   0.23200   0.99100   0.03600   1.00000
O2   0.30100   0.98600   0.35800   1.00000
O3   0.78900   0.01300   0.35200   1.00000
O4   0.06500   0.25000   0.13500   1.00000
O5   0.04200   0.75000   0.14700   1.00000
O6   0.06300   0.75000   0.39900   1.00000
O7   0.52100   0.75000   0.18100   1.00000
O8   0.52100   0.25000   0.30300   1.00000
O9   0.63200   0.25000   0.09500   1.00000
O-H10   0.07500   0.25000   0.42400   1.00000