data_global
_chemical_name_mineral 'Calcioolivine'
loop_
_publ_author_name
'Zadov A E'
'Gazeev V M'
'Pertsev N N'
'Gurbanov A G'
'Gobechiya E R'
'Yamnova N A'
'Chukanov N V'
_journal_name_full 'Geology of Ore Deposits'
_journal_volume 51 
_journal_year 2009
_journal_page_first 741
_journal_page_last 749
_publ_section_title
;
 Calcioolivine, gamma-Ca2SiO4, an old and new mineral species
 Kabarda-Balkaria Republic, Russia
;
_database_code_amcsd 0018297
_chemical_compound_source 'Mt. Lakargi, Upper Chegem Plateau, northern Caucasus,'
_chemical_formula_sum 'Ca2 Si O4'
_cell_length_a 5.074
_cell_length_b 11.211
_cell_length_c 6.753
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 384.142
_exptl_crystal_density_diffrn      2.978
_symmetry_space_group_name_H-M 'P b n m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,y,1/2-z'
  '-x,-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,z'
  '1/2+x,1/2-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
Ca1   0.00000   0.00000   0.00000   0.04939
Ca2   0.98900   0.27960   0.25000   0.04813
Si   0.42970   0.09910   0.25000   0.04306
O1   0.74100   0.09020   0.25000   0.04559
O2   0.29500   0.96190   0.25000   0.02153
O3   0.30000   0.16040   0.05960   0.03293