data_global
_chemical_name_mineral 'Hennomartinite'
loop_
_publ_author_name
'Libowitzky E'
'Armbruster T'
_journal_name_full 'American Mineralogist'
_journal_volume 81 
_journal_year 1996
_journal_page_first 9
_journal_page_last 18
_publ_section_title
;
 Lawsonite-type phase transitions in hennomartinite, SrMn2[Si2O7](OH)2.H2O
 T = 245 C
;
_database_code_amcsd 0001770
_chemical_formula_sum 'Sr Mn2 Si2 O10 H4'
_cell_length_a 6.255
_cell_length_b 9.067
_cell_length_c 13.431
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 761.727
_exptl_crystal_density_diffrn      3.642
_symmetry_space_group_name_H-M 'C m c m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,y,z'
  '1/2-x,1/2+y,z'
  'x,-y,-z'
  '1/2+x,1/2-y,-z'
  'x,y,1/2-z'
  '1/2+x,1/2+y,1/2-z'
  '-x,-y,1/2+z'
  '1/2-x,1/2-y,1/2+z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Sr   0.00000   0.31258   0.25000   1.00000 ?
Mn   0.25000   0.25000   0.00000   1.00000 ?
Si   0.00000   0.96991   0.13224   1.00000 ?
O1   0.00000   0.01980   0.25000   1.00000 ?
O2   0.28510   0.37230   0.11492   1.00000 ?
O3   0.00000   0.12750   0.07680   1.00000 ?
O4   0.00000   0.63400   0.04240   1.00000 ?
O5   0.02900   0.60680   0.25000   0.50000 ?
Hw   0.00000   0.63700   0.19800   1.00000   0.06003
Hh   0.00000   0.55200   0.04600   1.00000   0.09005
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Sr 0.02270 0.02200 0.01440 0.00000 0.00000 0.00000
Mn 0.01090 0.01160 0.01120 -0.00040 0.00010 -0.00270
Si 0.01200 0.00900 0.00820 0.00000 0.00000 0.00000
O1 0.02800 0.02200 0.00770 0.00000 0.00000 0.00000
O2 0.01440 0.01780 0.01640 -0.00390 0.00180 -0.00550
O3 0.02160 0.01150 0.01480 0.00000 0.00000 0.00380
O4 0.01810 0.01270 0.02160 0.00000 0.00000 0.00320
O5 0.05000 0.03700 0.02500 0.00000 0.00000 0.00000