data_global
_chemical_name_mineral 'Glaucochroite'
loop_
_publ_author_name
'Lager G A'
'Meagher E P'
_journal_name_full 'American Mineralogist'
_journal_volume 63 
_journal_year 1978
_journal_page_first 365
_journal_page_last 377
_publ_section_title
;
 High-temperature structural study of six olivines
 T = 25 deg C
;
_database_code_amcsd 0000650
_chemical_formula_sum 'Mn.87 Mg.1 Zn.05 Ca.98 Si O4'
_cell_length_a 4.913
_cell_length_b 11.151
_cell_length_c 6.488
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 355.444
_exptl_crystal_density_diffrn      3.454
_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_occupancy
Mn1   0.00000   0.00000   0.00000   0.85000
Mg1   0.00000   0.00000   0.00000   0.10000
Zn1   0.00000   0.00000   0.00000   0.05000
Ca2   0.98030   0.27800   0.25000   0.98000
Mn2   0.98030   0.27800   0.25000   0.02000
Si   0.41610   0.08680   0.25000   1.00000
O1   0.74660   0.08430   0.25000   1.00000
O2   0.23050   0.45280   0.25000   1.00000
O3   0.28180   0.15270   0.04930   1.00000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Mn1 0.00452 0.00945 0.00661 -0.00083 -0.00113 -0.00110
Mg1 0.00452 0.00945 0.00661 -0.00083 -0.00113 -0.00110
Zn1 0.00452 0.00945 0.00661 -0.00083 -0.00113 -0.00110
Ca2 0.00477 0.00630 0.00427 -0.00028 0.00000 0.00000
Mn2 0.00477 0.00630 0.00427 -0.00028 0.00000 0.00000
Si 0.00281 0.00567 0.00640 -0.00139 0.00000 0.00000
O1 0.00440 0.01008 0.00874 -0.00194 0.00000 0.00000
O2 0.00636 0.00504 0.01130 0.00278 0.00000 0.00000
O3 0.00685 0.00882 0.00618 0.00056 0.00016 0.00110