data_global
_chemical_name_mineral 'Sheldrickite'
loop_
_publ_author_name
'Grice J D'
'Gault R A'
'Van Velthuizen J'
_journal_name_full 'The Canadian Mineralogist'
_journal_volume 35 
_journal_year 1997
_journal_page_first 181
_journal_page_last 187
_publ_section_title
;
 Sheldrickite, a new sodium-calcium-fluorocarbonate mineral
 species from Mont Saint-Hilaire, Quebec
;
_database_code_amcsd 0005522
_chemical_compound_source 'Mont Saint-Hilaire, Quebec, Canada'
_chemical_formula_sum 'Na Ca3 C2 O7 F3'
_cell_length_a 6.726
_cell_length_b 6.726
_cell_length_c 15.044
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 589.397
_exptl_crystal_density_diffrn      2.842
_symmetry_space_group_name_H-M 'P 32'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-y,x-y,2/3+z'
  '-x+y,-x,1/3+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Na   0.00100   0.29700   0.16500   0.02300
Ca1   0.61610  -0.00090   0.00000   0.01100
Ca2  -0.00110   0.62840   0.00450   0.00800
Ca3   0.37060   0.37100  -0.00430   0.01600
C1  -0.43300   0.31700   0.16800   0.01200
C2  -0.56800   0.75200   0.16900   0.01300
O1   0.66400   0.34800   0.09000   0.01600
O2   0.66800   0.33300   0.23800   0.01300
O3   0.35300   0.27300   0.16700   0.01700
O4   0.32100   0.65400  -0.09200   0.01500
O5   0.33600   0.66600  -0.23900   0.01500
O6  -0.35400   0.92100   0.16500   0.02500
OW   0.20300   0.20200  -0.16900   0.02200
F1   0.99700   0.26600   0.01000   0.02300
F2   0.27100   0.00200  -0.00500   0.01800
F3   0.73000   0.73400  -0.02000   0.01500