data_global
_chemical_name_mineral 'Alarsite'
loop_
_publ_author_name
'Machatschki F'
_journal_name_full 'Zeitschrift fur Kristallographie'
_journal_volume 94 
_journal_year 1936
_journal_page_first 222
_journal_page_last 230
_publ_section_title
;
 Die kristallstruktur von tiefquarz SiO2 und aluminiumorthoarsenat AlAsO4
;
_database_code_amcsd 0010554
_chemical_formula_sum 'Al As O4'
_cell_length_a 5.03
_cell_length_b 5.03
_cell_length_c 11.22
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 245.844
_exptl_crystal_density_diffrn      3.362
_symmetry_space_group_name_H-M 'P 31 2 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'y,x,1/3-z'
  '-y,x-y,1/3+z'
  '-x,-x+y,2/3-z'
  '-x+y,-x,2/3+z'
  'x-y,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Al   0.45600   0.00000   0.00000
As   0.45600   0.00000   0.50000
O1   0.40600   0.27500   0.06700
O2   0.40600   0.27500   0.56700