data_1010703
_chemical_name_systematic          'Calcium magnesium fluoride arsenate'
_chemical_name_mineral             'Tilasite'
_chemical_formula_structural       'Ca Mg F As O4'
_chemical_formula_sum              'As Ca F Mg O4'
_publ_section_title
;
Titanit und Tilasit. Ueber die Verwandtschaft der Silikate mit den
Phosphaten und Arsenaten
;
_publ_author_name                  'Strunz, H'
_journal_name_full
;
Zeitschrift fuer Kristallographie, Kristallgeometrie, Kristallphysik,
Kristallchemie (-144,1977)
;
_journal_coden_ASTM                ZEKGAX
_journal_volume                    96
_journal_year                      1937
_journal_page_first                7
_journal_page_last                 14
_cell_length_a                     6.66
_cell_length_b                     8.95
_cell_length_c                     7.56
_cell_angle_alpha                  90
_cell_angle_beta                   121
_cell_angle_gamma                  90
_cell_volume                       386.3
_cell_formula_units_Z              4
_exptl_crystal_density_meas        3.75
_symmetry_space_group_name_H-M     'C 1 2/c 1'
_symmetry_Int_Tables_number        15
_symmetry_cell_setting             monoclinic
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '-x,y,1/2-z'
  '-x,-y,-z'
  'x,-y,1/2+z'
  '1/2+x,1/2+y,z'
  '1/2-x,1/2+y,1/2-z'
  '1/2-x,1/2-y,-z'
  '1/2+x,1/2-y,1/2+z'