The material structure described by KMg3AlSi3O11F crystallizes in the monoclinic Cc space group. K(1) is bonded in a 12-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(10), one O(11), one O(7), one O(8), one O(9), and one F(1) atom to form MgO5F octahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, edges with three equivalent Mg(2)O5F octahedra, and edges with three equivalent Mg(3)O5F octahedra. In the second Mg site, Mg(2) is bonded to one O(10), one O(11), one O(7), one O(8), one O(9), and one F(1) atom to form MgO5F octahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, edges with three equivalent Mg(1)O5F octahedra, and edges with three equivalent Mg(3)O5F octahedra. In the third Mg site, Mg(3) is bonded to one O(10), one O(11), one O(7), one O(8), one O(9), and one F(1) atom to form MgO5F octahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, edges with three equivalent Mg(1)O5F octahedra, and edges with three equivalent Mg(2)O5F octahedra. Al(1) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Mg(1)O5F octahedra,  a cornercorner with one Mg(2)O5F octahedra,  a cornercorner with one Mg(3)O5F octahedra, and corners with three equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 61-62°. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O5F octahedra,  a cornercorner with one Mg(2)O5F octahedra,  a cornercorner with one Mg(3)O5F octahedra, and corners with three equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-58°. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O5F octahedra,  a cornercorner with one Mg(2)O5F octahedra,  a cornercorner with one Mg(3)O5F octahedra, and corners with three equivalent Al(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-59°. In the third Si site, Si(3) is bonded to one O(10), one O(2), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O5F octahedra,  a cornercorner with one Mg(2)O5F octahedra,  a cornercorner with one Mg(3)O5F octahedra, and corners with three equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-58°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Al(1), and one Si(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Si(1), and one Si(3) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to two equivalent K(1), one Al(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent K(1), one Si(1), and one Si(3) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent K(1), one Al(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent K(1), one Si(1), and one Si(3) atom. In the seventh O site, O(7) is bonded to one Mg(1), one Mg(2), one Mg(3), and one Al(1) atom to form distorted corner-sharing OMg3Al tetrahedra. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Mg(3), and one Si(1) atom. In the ninth O site, O(9) is bonded to one Mg(1), one Mg(2), one Mg(3), and one Si(2) atom to form distorted corner-sharing OMg3Si trigonal pyramids. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Mg(3), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a trigonal non-coplanar geometry to one Mg(1), one Mg(2), and one Mg(3) atom. F(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Mg(2), and one Mg(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_KMg3AlSi3O11F
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.387
_cell_length_b   5.387
_cell_length_c   20.691
_cell_angle_alpha   87.391
_cell_angle_beta   87.391
_cell_angle_gamma   119.881
_symmetry_Int_Tables_number   1
_cell_volume   518.423
_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
  K  K0  1  0.084  0.910  0.263  1.0
  K  K1  1  0.910  0.084  0.763  1.0
  Mg  Mg2  1  0.336  0.169  0.498  1.0
  Mg  Mg3  1  0.827  0.659  1.000  1.0
  Mg  Mg4  1  0.659  0.827  0.500  1.0
  Mg  Mg5  1  0.169  0.336  0.998  1.0
  Mg  Mg6  1  0.000  0.501  0.500  1.0
  Mg  Mg7  1  0.501  0.000  1.000  1.0
  Al  Al8  1  0.726  0.212  0.366  1.0
  Al  Al9  1  0.212  0.726  0.866  1.0
  Si  Si10  1  0.789  0.279  0.134  1.0
  Si  Si11  1  0.279  0.789  0.634  1.0
  Si  Si12  1  0.390  0.549  0.363  1.0
  Si  Si13  1  0.457  0.612  0.134  1.0
  Si  Si14  1  0.612  0.457  0.634  1.0
  Si  Si15  1  0.549  0.390  0.863  1.0
  O  O16  1  0.559  0.392  0.336  1.0
  O  O17  1  0.613  0.436  0.163  1.0
  O  O18  1  0.436  0.613  0.663  1.0
  O  O19  1  0.392  0.559  0.836  1.0
  O  O20  1  0.567  0.880  0.333  1.0
  O  O21  1  0.113  0.432  0.162  1.0
  O  O22  1  0.432  0.113  0.662  1.0
  O  O23  1  0.880  0.567  0.833  1.0
  O  O24  1  0.080  0.398  0.334  1.0
  O  O25  1  0.613  0.936  0.162  1.0
  O  O26  1  0.936  0.613  0.662  1.0
  O  O27  1  0.398  0.080  0.834  1.0
  O  O28  1  0.689  0.182  0.452  1.0
  O  O29  1  0.811  0.307  0.055  1.0
  O  O30  1  0.307  0.811  0.555  1.0
  O  O31  1  0.182  0.689  0.952  1.0
  O  O32  1  0.357  0.523  0.444  1.0
  O  O33  1  0.484  0.641  0.055  1.0
  O  O34  1  0.641  0.484  0.555  1.0
  O  O35  1  0.523  0.357  0.944  1.0
  O  O36  1  0.148  0.981  0.045  1.0
  O  O37  1  0.981  0.148  0.545  1.0
  F  F38  1  0.016  0.842  0.451  1.0
  F  F39  1  0.842  0.016  0.951  1.0
[/CIF]
.
The material structure described by KMg3AlSi3O11F crystallizes in the monoclinic Cc space group. K(1) is bonded in a 12-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(10), one O(11), one O(7), one O(8), one O(9), and one F(1) atom to form MgO5F octahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, edges with three equivalent Mg(2)O5F octahedra, and edges with three equivalent Mg(3)O5F octahedra. In the second Mg site, Mg(2) is bonded to one O(10), one O(11), one O(7), one O(8), one O(9), and one F(1) atom to form MgO5F octahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, edges with three equivalent Mg(1)O5F octahedra, and edges with three equivalent Mg(3)O5F octahedra. In the third Mg site, Mg(3) is bonded to one O(10), one O(11), one O(7), one O(8), one O(9), and one F(1) atom to form MgO5F octahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, edges with three equivalent Mg(1)O5F octahedra, and edges with three equivalent Mg(2)O5F octahedra. Al(1) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Mg(1)O5F octahedra,  a cornercorner with one Mg(2)O5F octahedra,  a cornercorner with one Mg(3)O5F octahedra, and corners with three equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 61-62°. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O5F octahedra,  a cornercorner with one Mg(2)O5F octahedra,  a cornercorner with one Mg(3)O5F octahedra, and corners with three equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-58°. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O5F octahedra,  a cornercorner with one Mg(2)O5F octahedra,  a cornercorner with one Mg(3)O5F octahedra, and corners with three equivalent Al(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-59°. In the third Si site, Si(3) is bonded to one O(10), one O(2), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O5F octahedra,  a cornercorner with one Mg(2)O5F octahedra,  a cornercorner with one Mg(3)O5F octahedra, and corners with three equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-58°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Al(1), and one Si(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Si(1), and one Si(3) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to two equivalent K(1), one Al(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent K(1), one Si(1), and one Si(3) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent K(1), one Al(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent K(1), one Si(1), and one Si(3) atom. In the seventh O site, O(7) is bonded to one Mg(1), one Mg(2), one Mg(3), and one Al(1) atom to form distorted corner-sharing OMg3Al tetrahedra. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Mg(3), and one Si(1) atom. In the ninth O site, O(9) is bonded to one Mg(1), one Mg(2), one Mg(3), and one Si(2) atom to form distorted corner-sharing OMg3Si trigonal pyramids. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Mg(3), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a trigonal non-coplanar geometry to one Mg(1), one Mg(2), and one Mg(3) atom. F(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Mg(2), and one Mg(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_KMg3AlSi3O11F
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.387
_cell_length_b   5.387
_cell_length_c   20.691
_cell_angle_alpha   87.391
_cell_angle_beta   87.391
_cell_angle_gamma   119.881
_symmetry_Int_Tables_number   1
_cell_volume   518.423
_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
  K  K0  1  0.084  0.910  0.263  1.0
  K  K1  1  0.910  0.084  0.763  1.0
  Mg  Mg2  1  0.336  0.169  0.498  1.0
  Mg  Mg3  1  0.827  0.659  1.000  1.0
  Mg  Mg4  1  0.659  0.827  0.500  1.0
  Mg  Mg5  1  0.169  0.336  0.998  1.0
  Mg  Mg6  1  0.000  0.501  0.500  1.0
  Mg  Mg7  1  0.501  0.000  1.000  1.0
  Al  Al8  1  0.726  0.212  0.366  1.0
  Al  Al9  1  0.212  0.726  0.866  1.0
  Si  Si10  1  0.789  0.279  0.134  1.0
  Si  Si11  1  0.279  0.789  0.634  1.0
  Si  Si12  1  0.390  0.549  0.363  1.0
  Si  Si13  1  0.457  0.612  0.134  1.0
  Si  Si14  1  0.612  0.457  0.634  1.0
  Si  Si15  1  0.549  0.390  0.863  1.0
  O  O16  1  0.559  0.392  0.336  1.0
  O  O17  1  0.613  0.436  0.163  1.0
  O  O18  1  0.436  0.613  0.663  1.0
  O  O19  1  0.392  0.559  0.836  1.0
  O  O20  1  0.567  0.880  0.333  1.0
  O  O21  1  0.113  0.432  0.162  1.0
  O  O22  1  0.432  0.113  0.662  1.0
  O  O23  1  0.880  0.567  0.833  1.0
  O  O24  1  0.080  0.398  0.334  1.0
  O  O25  1  0.613  0.936  0.162  1.0
  O  O26  1  0.936  0.613  0.662  1.0
  O  O27  1  0.398  0.080  0.834  1.0
  O  O28  1  0.689  0.182  0.452  1.0
  O  O29  1  0.811  0.307  0.055  1.0
  O  O30  1  0.307  0.811  0.555  1.0
  O  O31  1  0.182  0.689  0.952  1.0
  O  O32  1  0.357  0.523  0.444  1.0
  O  O33  1  0.484  0.641  0.055  1.0
  O  O34  1  0.641  0.484  0.555  1.0
  O  O35  1  0.523  0.357  0.944  1.0
  O  O36  1  0.148  0.981  0.045  1.0
  O  O37  1  0.981  0.148  0.545  1.0
  F  F38  1  0.016  0.842  0.451  1.0
  F  F39  1  0.842  0.016  0.951  1.0
[/CIF]
.