data_global
_chemical_name_mineral 'Helmutwinklerite'
loop_
_publ_author_name
'Krause W'
'Belendorff K'
'Bernhardt H J'
'McCammon C A'
'Effenberger H'
'Mikenda W'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 10 
_journal_year 1998
_journal_page_first 179
_journal_page_last 206
_publ_section_title
;
 Crystal chemistry of the tsumcorite-group minerals. New data on ferrilotharmeyerite,
 tsumcorite, thometzekite, mounanaite, helmutwinklerite, and a redefinition of gartrellite
;
_database_code_amcsd 0006712
_chemical_compound_source 'Tsumeb mine, Namibia'
_chemical_formula_sum 'Pb Zn2 As2 (O10 H2)'
_cell_length_a 5.606
_cell_length_b 5.610
_cell_length_c 7.617
_cell_angle_alpha 70.19
_cell_angle_beta 69.91
_cell_angle_gamma 69.18
_cell_volume 203.771
_exptl_crystal_density_diffrn      5.296
_symmetry_space_group_name_H-M 'P -1'
loop_
_space_group_symop_operation_xyz
  'x,y,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
PbMe1   0.00000   0.00000   0.00000   0.03445
Zn1   0.00000   0.50000   0.50000   0.02305
Zn2   0.50000   0.00000   0.50000   0.02330
AsX   0.42101   0.42320   0.77763   0.02204
O-H1   0.15540   0.15720   0.40590   0.03926
O2   0.31310   0.30930   0.65090   0.02394
O3a   0.24950   0.68310   0.25810   0.03242
O3b   0.68420   0.24710   0.26100   0.03065
O4   0.27860   0.28740   0.00850   0.06371