The material described by Cr2As6O19 crystallizes in the orthorhombic Pmmn space group. Cr(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form CrO6 octahedra that share corners with two equivalent As(2)O4 tetrahedra and corners with four equivalent As(1)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form AsO4 tetrahedra that share corners with two equivalent Cr(1)O6 octahedra and corners with two equivalent As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-53°. In the second As site, As(2) is bonded to one O(4), one O(7), and two equivalent O(3) atoms to form AsO4 tetrahedra that share corners with two equivalent Cr(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. There are seven inequivalent O sites. In the first O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent As(2) atoms. In the second O site, O(5) is bonded in a bent 120 degrees geometry to one Cr(1) and one As(1) atom. In the third O site, O(6) is bonded in a bent 120 degrees geometry to two equivalent As(1) atoms. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent As(1) atoms. In the fifth O site, O(7) is bonded in a single-bond geometry to one As(2) atom. In the sixth O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cr(1) and one As(1) atom. In the seventh O site, O(3) is bonded in a bent 120 degrees geometry to one Cr(1) and one As(2) atom. is represented by the CIF card [CIF]
data_Cr2As6O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.115
_cell_length_b   11.451
_cell_length_c   13.336
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   781.054
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Cr  Cr0  1  0.000  0.000  0.500  1.0
  Cr  Cr1  1  0.000  0.000  0.000  1.0
  Cr  Cr2  1  0.000  0.500  0.500  1.0
  Cr  Cr3  1  0.000  0.500  0.000  1.0
  As  As4  1  0.509  0.110  0.370  1.0
  As  As5  1  0.509  0.110  0.130  1.0
  As  As6  1  0.509  0.390  0.370  1.0
  As  As7  1  0.509  0.390  0.130  1.0
  As  As8  1  0.491  0.890  0.630  1.0
  As  As9  1  0.491  0.890  0.870  1.0
  As  As10  1  0.491  0.610  0.630  1.0
  As  As11  1  0.491  0.610  0.870  1.0
  As  As12  1  0.060  0.750  0.367  1.0
  As  As13  1  0.060  0.750  0.133  1.0
  As  As14  1  0.940  0.250  0.633  1.0
  As  As15  1  0.940  0.250  0.867  1.0
  O  O16  1  0.363  0.089  0.250  1.0
  O  O17  1  0.363  0.411  0.250  1.0
  O  O18  1  0.637  0.911  0.750  1.0
  O  O19  1  0.637  0.589  0.750  1.0
  O  O20  1  0.253  0.118  0.448  1.0
  O  O21  1  0.253  0.118  0.052  1.0
  O  O22  1  0.253  0.382  0.448  1.0
  O  O23  1  0.253  0.382  0.052  1.0
  O  O24  1  0.747  0.882  0.552  1.0
  O  O25  1  0.747  0.882  0.948  1.0
  O  O26  1  0.747  0.618  0.552  1.0
  O  O27  1  0.747  0.618  0.948  1.0
  O  O28  1  0.177  0.872  0.428  1.0
  O  O29  1  0.177  0.872  0.072  1.0
  O  O30  1  0.177  0.628  0.428  1.0
  O  O31  1  0.177  0.628  0.072  1.0
  O  O32  1  0.823  0.128  0.572  1.0
  O  O33  1  0.823  0.128  0.928  1.0
  O  O34  1  0.823  0.372  0.572  1.0
  O  O35  1  0.823  0.372  0.928  1.0
  O  O36  1  0.231  0.750  0.250  1.0
  O  O37  1  0.769  0.250  0.750  1.0
  O  O38  1  0.765  0.018  0.381  1.0
  O  O39  1  0.765  0.018  0.119  1.0
  O  O40  1  0.765  0.482  0.381  1.0
  O  O41  1  0.765  0.482  0.119  1.0
  O  O42  1  0.235  0.982  0.619  1.0
  O  O43  1  0.235  0.982  0.881  1.0
  O  O44  1  0.235  0.518  0.619  1.0
  O  O45  1  0.235  0.518  0.881  1.0
  O  O46  1  0.659  0.250  0.364  1.0
  O  O47  1  0.659  0.250  0.136  1.0
  O  O48  1  0.341  0.750  0.636  1.0
  O  O49  1  0.341  0.750  0.864  1.0
  O  O50  1  0.733  0.750  0.334  1.0
  O  O51  1  0.733  0.750  0.166  1.0
  O  O52  1  0.267  0.250  0.666  1.0
  O  O53  1  0.267  0.250  0.834  1.0
[/CIF]
.
The material described by Cr2As6O19 crystallizes in the orthorhombic Pmmn space group. Cr(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form CrO6 octahedra that share corners with two equivalent As(2)O4 tetrahedra and corners with four equivalent As(1)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form AsO4 tetrahedra that share corners with two equivalent Cr(1)O6 octahedra and corners with two equivalent As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-53°. In the second As site, As(2) is bonded to one O(4), one O(7), and two equivalent O(3) atoms to form AsO4 tetrahedra that share corners with two equivalent Cr(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. There are seven inequivalent O sites. In the first O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent As(2) atoms. In the second O site, O(5) is bonded in a bent 120 degrees geometry to one Cr(1) and one As(1) atom. In the third O site, O(6) is bonded in a bent 120 degrees geometry to two equivalent As(1) atoms. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent As(1) atoms. In the fifth O site, O(7) is bonded in a single-bond geometry to one As(2) atom. In the sixth O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cr(1) and one As(1) atom. In the seventh O site, O(3) is bonded in a bent 120 degrees geometry to one Cr(1) and one As(2) atom. is represented by the CIF card [CIF]
data_Cr2As6O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.115
_cell_length_b   11.451
_cell_length_c   13.336
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   781.054
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Cr  Cr0  1  0.000  0.000  0.500  1.0
  Cr  Cr1  1  0.000  0.000  0.000  1.0
  Cr  Cr2  1  0.000  0.500  0.500  1.0
  Cr  Cr3  1  0.000  0.500  0.000  1.0
  As  As4  1  0.509  0.110  0.370  1.0
  As  As5  1  0.509  0.110  0.130  1.0
  As  As6  1  0.509  0.390  0.370  1.0
  As  As7  1  0.509  0.390  0.130  1.0
  As  As8  1  0.491  0.890  0.630  1.0
  As  As9  1  0.491  0.890  0.870  1.0
  As  As10  1  0.491  0.610  0.630  1.0
  As  As11  1  0.491  0.610  0.870  1.0
  As  As12  1  0.060  0.750  0.367  1.0
  As  As13  1  0.060  0.750  0.133  1.0
  As  As14  1  0.940  0.250  0.633  1.0
  As  As15  1  0.940  0.250  0.867  1.0
  O  O16  1  0.363  0.089  0.250  1.0
  O  O17  1  0.363  0.411  0.250  1.0
  O  O18  1  0.637  0.911  0.750  1.0
  O  O19  1  0.637  0.589  0.750  1.0
  O  O20  1  0.253  0.118  0.448  1.0
  O  O21  1  0.253  0.118  0.052  1.0
  O  O22  1  0.253  0.382  0.448  1.0
  O  O23  1  0.253  0.382  0.052  1.0
  O  O24  1  0.747  0.882  0.552  1.0
  O  O25  1  0.747  0.882  0.948  1.0
  O  O26  1  0.747  0.618  0.552  1.0
  O  O27  1  0.747  0.618  0.948  1.0
  O  O28  1  0.177  0.872  0.428  1.0
  O  O29  1  0.177  0.872  0.072  1.0
  O  O30  1  0.177  0.628  0.428  1.0
  O  O31  1  0.177  0.628  0.072  1.0
  O  O32  1  0.823  0.128  0.572  1.0
  O  O33  1  0.823  0.128  0.928  1.0
  O  O34  1  0.823  0.372  0.572  1.0
  O  O35  1  0.823  0.372  0.928  1.0
  O  O36  1  0.231  0.750  0.250  1.0
  O  O37  1  0.769  0.250  0.750  1.0
  O  O38  1  0.765  0.018  0.381  1.0
  O  O39  1  0.765  0.018  0.119  1.0
  O  O40  1  0.765  0.482  0.381  1.0
  O  O41  1  0.765  0.482  0.119  1.0
  O  O42  1  0.235  0.982  0.619  1.0
  O  O43  1  0.235  0.982  0.881  1.0
  O  O44  1  0.235  0.518  0.619  1.0
  O  O45  1  0.235  0.518  0.881  1.0
  O  O46  1  0.659  0.250  0.364  1.0
  O  O47  1  0.659  0.250  0.136  1.0
  O  O48  1  0.341  0.750  0.636  1.0
  O  O49  1  0.341  0.750  0.864  1.0
  O  O50  1  0.733  0.750  0.334  1.0
  O  O51  1  0.733  0.750  0.166  1.0
  O  O52  1  0.267  0.250  0.666  1.0
  O  O53  1  0.267  0.250  0.834  1.0
[/CIF]
.