data_global
_chemical_name_mineral 'Hornesite'
loop_
_publ_author_name
'Rojo J M'
'Mesa J L'
'Pizarro J L'
'Lezama L'
'Arriortua M I'
'Rojo T'
_journal_name_full 'Materials Research Bulletin'
_journal_volume 31 
_journal_year 1996
_journal_page_first 925
_journal_page_last 934
_publ_section_title
;
 Spectroscopic and magnetic study of the (Mg,M)3(AsO4)2*8H2O (M = Ni2+, Co2+)
 arsenates
 Note: z(Wat2) corrected
;
_database_code_amcsd 0014376
_chemical_compound_source 'Synthetic'
_chemical_formula_sum '(Mg2.484 Ni.516) As2 O16 H16'
_cell_length_a 10.2573
_cell_length_b 13.4211
_cell_length_c 4.7526
_cell_angle_alpha 90
_cell_angle_beta 105.076
_cell_angle_gamma 90
_cell_volume 631.745
_exptl_crystal_density_diffrn      2.695
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,z'
  '1/2+x,1/2-y,z'
  '-x,y,-z'
  '1/2-x,1/2+y,-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
MgM1   0.00000   0.00000   0.00000   0.64800   0.00557
NiM1   0.00000   0.00000   0.00000   0.35200   0.00557
MgM2   0.00000   0.38390   0.00000   0.91800   0.00557
NiM2   0.00000   0.38390   0.00000   0.08200   0.00557
As   0.31540   0.00000   0.37850   1.00000   0.00557
O1   0.14980   0.00000   0.38400   1.00000   0.00557
O2   0.40650   0.00000   0.73700   1.00000   0.00557
O3   0.33700   0.11080   0.21680   1.00000   0.00557
Wat1   0.09900   0.11270  -0.18850   1.00000   0.00557
Wat2   0.40140   0.22530   0.70750   1.00000   0.00557