data_global
_chemical_name_mineral 'Rammelsbergite'
loop_
_publ_author_name
'Kjekshus A'
'Rakke T'
'Andresen A'
_journal_name_full 'Acta Chemica Scandinavica'
_journal_volume A28 
_journal_year 1974
_journal_page_first 996
_journal_page_last 1000
_publ_section_title
;
 Compounds of the marcasite type crystal structure. IX. Structural data for
 FeAs2, FeSe2, NiAs2, NiSb2, and CuSe2
;
_database_code_amcsd 0011937
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Ni As2'
_cell_length_a 4.7582
_cell_length_b 5.7949
_cell_length_c 3.5440
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 97.720
_exptl_crystal_density_diffrn      7.087
_symmetry_space_group_name_H-M 'P n n m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  '1/2-x,1/2+y,1/2+z'
  '1/2+x,1/2-y,1/2-z'
  'x,y,-z'
  '-x,-y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ni   0.00000   0.00000   0.00000
As   0.20170   0.36910   0.00000