data_global
_chemical_name_mineral 'Wesselsite'
loop_
_publ_author_name
'Chakoumakos B C'
'Fernandez-Baca J A'
'Boatner L A'
_journal_name_full 'Journal of Solid State Chemistry'
_journal_volume 103 
_journal_year 1993
_journal_page_first 105
_journal_page_last 113
_publ_section_title
;
 Refinement of the structures of the layer silicates MCuSi4O10 (M=Ca,Sr,Ba)
 by Rietveld analysis of neutron powder diffraction data
 Note: gillespite structure
;
_database_code_amcsd 0013766
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Sr Cu Si4 O10'
_cell_length_a 7.3707
_cell_length_b 7.3707
_cell_length_c 15.5904
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 846.983
_exptl_crystal_density_diffrn      3.321
_symmetry_space_group_name_H-M 'P 4/n c c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-y,1/2-x,1/2+z'
  '1/2+y,1/2+x,1/2-z'
  '1/2+y,-x,-z'
  '1/2-y,x,z'
  'x,1/2-y,1/2+z'
  '-x,1/2+y,1/2-z'
  '1/2+x,1/2+y,-z'
  '1/2-x,1/2-y,z'
  'y,x,1/2+z'
  '-y,-x,1/2-z'
  '-y,1/2+x,-z'
  'y,1/2-x,z'
  '1/2-x,y,1/2+z'
  '1/2+x,-y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Sr   0.25000   0.75000   0.00000   0.00900
Cu   0.25000   0.25000   0.08830   0.00600
Si   0.50880   0.93080   0.15110   0.00600
O1   0.46640   0.96640   0.25000   0.02000
O2   0.71370   0.00080   0.13110   0.01100
O3   0.36670   0.01690   0.08650   0.01200
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 0.00700 0.00700 0.01100 0.00000 0.00000 0.00000
Cu 0.00450 0.00450 0.01000 0.00000 0.00000 0.00000
Si 0.00300 0.00400 0.01200 0.00000 0.00300 0.00000
O1 0.02700 0.02700 0.00600 -0.00400 0.01100 -0.01100
O2 0.00250 0.01300 0.01700 -0.00290 0.00110 0.00540
O3 0.00780 0.00430 0.02500 0.00230 -0.00800 -0.00300