data_global
_chemical_name_mineral 'Mariinskite'
loop_
_publ_author_name
'Yamnova N A'
'Aksenov S M'
'Pautov L A'
'Popov M P'
'Erokhin Y V'
_journal_name_full 'Crystallography Reports'
_journal_volume 59 
_journal_year 2014
_journal_page_first 30
_journal_page_last 35
_publ_section_title
;
 Specific features of cation distribution in the crystal structure
 of mariinskite BeCr2O4 (derivative of olivine-type structure)
 Note: Sample 2
;
_database_code_amcsd 0020028
_chemical_compound_source 'Mariinskoe deposit (Middle Urals, Russia)'
_chemical_formula_sum 'Al.37 Cr.66 Be.45 O2'
_cell_length_a 4.478
_cell_length_b 5.620
_cell_length_c 9.746
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 245.271
_exptl_crystal_density_diffrn      4.352
_symmetry_space_group_name_H-M 'P 21 21 21'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-x,1/2+y,1/2-z'
  '1/2+x,-y,-z'
  '-x,1/2-y,1/2+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
AlM1   0.25800   0.50200   0.50400   0.55000   0.00100
CrM1   0.25800   0.50200   0.50400   0.23000   0.00100
CrM2   0.25400   0.74100   0.24100   0.63000   0.01700
AlM2   0.25400   0.74100   0.24100   0.19000   0.01700
CrM3   0.74800   0.50000   0.48300   0.30000   0.00300
CrM4   0.24100   0.19300   0.24100   0.16000   0.07500
Be1   0.83300   0.73800   0.40900   0.70000   0.03800
Be2   0.15000   0.74900   0.40500   0.20000   0.03800
O1   0.48100   0.75000   0.42300   1.00000   0.02900
O2   0.01500   0.73300   0.06800   1.00000   0.01800
O3   0.49700   0.48600   0.16000   1.00000   0.00800
O4   0.50300   0.50100   0.65400   1.00000   0.01900