The compound described by KNaCaMg5Si8O22F2 is Esseneite-derived structured and crystallizes in the triclinic P1 space group. K(1) is bonded in a 10-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(21), one O(22), one O(5), one O(6), one O(7), and one O(8) atom. Na(1) is bonded in a 8-coordinate geometry to one O(1), one O(15), one O(16), one O(19), one O(2), one O(20), one O(7), and one O(8) atom. Ca(1) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(17), one O(18), one O(3), one O(4), one O(5), and one O(6) atom. There are five inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(1), one O(10), one O(2), one O(9), one F(1), and one F(2) atom to form MgO4F2 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  an edgeedge with one Mg(2)O4F2 octahedra, edges with two equivalent Mg(5)O4F2 octahedra, and edges with two equivalent Mg(3)O6 octahedra. In the second Mg site, Mg(2) is bonded to one O(11), one O(12), one O(3), one O(4), one F(1), and one F(2) atom to form MgO4F2 octahedra that share  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(1)O4F2 octahedra, edges with two equivalent Mg(5)O4F2 octahedra, and edges with two equivalent Mg(4)O6 octahedra. In the third Mg site, Mg(3) is bonded to one O(1), one O(10), one O(19), one O(2), one O(20), and one O(9) atom to form MgO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  an edgeedge with one Mg(5)O4F2 octahedra, and edges with two equivalent Mg(1)O4F2 octahedra. In the fourth Mg site, Mg(4) is bonded to one O(11), one O(12), one O(17), one O(18), one O(3), and one O(4) atom to form MgO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(5)O4F2 octahedra, and edges with two equivalent Mg(2)O4F2 octahedra. In the fifth Mg site, Mg(5) is bonded to one O(10), one O(11), one O(12), one O(9), one F(1), and one F(2) atom to form MgO4F2 octahedra that share  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(3)O6 octahedra,  an edgeedge with one Mg(4)O6 octahedra, edges with two equivalent Mg(1)O4F2 octahedra, and edges with two equivalent Mg(2)O4F2 octahedra. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(13), one O(17), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra, and corners with two equivalent Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-57°. In the second Si site, Si(2) is bonded to one O(14), one O(18), one O(2), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra, and corners with two equivalent Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-56°. In the third Si site, Si(3) is bonded to one O(15), one O(19), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra, and corners with two equivalent Si(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-57°. In the fourth Si site, Si(4) is bonded to one O(16), one O(20), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra, and corners with two equivalent Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-57°. In the fifth Si site, Si(5) is bonded to one O(13), one O(21), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(5)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Si(8)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-61°. In the sixth Si site, Si(6) is bonded to one O(10), one O(14), one O(22), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(5)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Si(7)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-61°. In the seventh Si site, Si(7) is bonded to one O(11), one O(15), one O(22), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O4F2 octahedra,  a cornercorner with one Mg(5)O4F2 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Si(6)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-60°. In the eighth Si site, Si(8) is bonded to one O(12), one O(16), one O(21), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O4F2 octahedra,  a cornercorner with one Mg(5)O4F2 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Si(5)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-60°. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Mg(1), one Mg(3), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Mg(1), one Mg(3), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Mg(2), one Mg(4), and one Si(3) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Mg(2), one Mg(4), and one Si(4) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(1), and one Si(5) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(2), and one Si(6) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one K(1), one Na(1), one Si(3), and one Si(7) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one K(1), one Na(1), one Si(4), and one Si(8) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Mg(1), one Mg(3), one Mg(5), and one Si(5) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Mg(1), one Mg(3), one Mg(5), and one Si(6) atom. In the eleventh O site, O(11) is bonded to one Mg(2), one Mg(4), one Mg(5), and one Si(7) atom to form a mixture of distorted corner and edge-sharing OMg3Si trigonal pyramids. In the twelfth O site, O(12) is bonded to one Mg(2), one Mg(4), one Mg(5), and one Si(8) atom to form a mixture of distorted corner and edge-sharing OMg3Si trigonal pyramids. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(1), and one Si(5) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(2), and one Si(6) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one K(1), one Na(1), one Si(3), and one Si(7) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 150 degrees geometry to one K(1), one Na(1), one Si(4), and one Si(8) atom. In the seventeenth O site, O(17) is bonded in a distorted T-shaped geometry to one Ca(1), one Mg(4), and one Si(1) atom. In the eighteenth O site, O(18) is bonded in a distorted T-shaped geometry to one Ca(1), one Mg(4), and one Si(2) atom. In the nineteenth O site, O(19) is bonded in a distorted T-shaped geometry to one Na(1), one Mg(3), and one Si(3) atom. In the twentieth O site, O(20) is bonded in a distorted T-shaped geometry to one Na(1), one Mg(3), and one Si(4) atom. In the twenty-first O site, O(21) is bonded in a 3-coordinate geometry to one K(1), one Si(5), and one Si(8) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one K(1), one Si(6), and one Si(7) atom. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Mg(2), and one Mg(5) atom. In the second F site, F(2) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Mg(2), and one Mg(5) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_KNaCaMg5Si8(O11F)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.320
_cell_length_b   10.104
_cell_length_c   10.394
_cell_angle_alpha   60.929
_cell_angle_beta   82.943
_cell_angle_gamma   75.359
_symmetry_Int_Tables_number   1
_cell_volume   472.464
_cell_formula_units_Z   1
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  0.975  0.514  0.998  1.0
  Na  Na1  1  0.500  0.723  0.553  1.0
  Ca  Ca2  1  0.500  0.276  0.447  1.0
  Mg  Mg3  1  0.500  0.909  0.182  1.0
  Mg  Mg4  1  0.500  0.089  0.823  1.0
  Mg  Mg5  1  0.000  0.818  0.363  1.0
  Mg  Mg6  1  0.000  0.178  0.645  1.0
  Mg  Mg7  1  1.000  0.000  0.001  1.0
  Si  Si8  1  0.805  0.545  0.344  1.0
  Si  Si9  1  0.195  0.112  0.343  1.0
  Si  Si10  1  0.196  0.458  0.657  1.0
  Si  Si11  1  0.804  0.886  0.656  1.0
  Si  Si12  1  0.299  0.641  0.169  1.0
  Si  Si13  1  0.701  0.190  0.169  1.0
  Si  Si14  1  0.700  0.361  0.830  1.0
  Si  Si15  1  0.300  0.810  0.830  1.0
  O  O16  1  0.729  0.714  0.335  1.0
  O  O17  1  0.271  0.951  0.335  1.0
  O  O18  1  0.275  0.288  0.659  1.0
  O  O19  1  0.724  0.053  0.659  1.0
  O  O20  1  0.591  0.539  0.237  1.0
  O  O21  1  0.410  0.223  0.238  1.0
  O  O22  1  0.407  0.456  0.766  1.0
  O  O23  1  0.594  0.778  0.766  1.0
  O  O24  1  0.219  0.805  0.170  1.0
  O  O25  1  0.781  0.025  0.170  1.0
  O  O26  1  0.782  0.195  0.829  1.0
  O  O27  1  0.218  0.976  0.829  1.0
  O  O28  1  0.097  0.525  0.261  1.0
  O  O29  1  0.903  0.214  0.261  1.0
  O  O30  1  0.908  0.471  0.742  1.0
  O  O31  1  0.092  0.787  0.742  1.0
  O  O32  1  0.797  0.387  0.494  1.0
  O  O33  1  0.203  0.118  0.494  1.0
  O  O34  1  0.201  0.608  0.502  1.0
  O  O35  1  0.799  0.889  0.502  1.0
  O  O36  1  0.305  0.666  0.000  1.0
  O  O37  1  0.696  0.334  0.000  1.0
  F  F38  1  0.714  0.900  1.000  1.0
  F  F39  1  0.287  0.099  1.000  1.0
[/CIF]
.
The compound described by KNaCaMg5Si8O22F2 is Esseneite-derived structured and crystallizes in the triclinic P1 space group. K(1) is bonded in a 10-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(21), one O(22), one O(5), one O(6), one O(7), and one O(8) atom. Na(1) is bonded in a 8-coordinate geometry to one O(1), one O(15), one O(16), one O(19), one O(2), one O(20), one O(7), and one O(8) atom. Ca(1) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(17), one O(18), one O(3), one O(4), one O(5), and one O(6) atom. There are five inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(1), one O(10), one O(2), one O(9), one F(1), and one F(2) atom to form MgO4F2 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  an edgeedge with one Mg(2)O4F2 octahedra, edges with two equivalent Mg(5)O4F2 octahedra, and edges with two equivalent Mg(3)O6 octahedra. In the second Mg site, Mg(2) is bonded to one O(11), one O(12), one O(3), one O(4), one F(1), and one F(2) atom to form MgO4F2 octahedra that share  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(1)O4F2 octahedra, edges with two equivalent Mg(5)O4F2 octahedra, and edges with two equivalent Mg(4)O6 octahedra. In the third Mg site, Mg(3) is bonded to one O(1), one O(10), one O(19), one O(2), one O(20), and one O(9) atom to form MgO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  an edgeedge with one Mg(5)O4F2 octahedra, and edges with two equivalent Mg(1)O4F2 octahedra. In the fourth Mg site, Mg(4) is bonded to one O(11), one O(12), one O(17), one O(18), one O(3), and one O(4) atom to form MgO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(5)O4F2 octahedra, and edges with two equivalent Mg(2)O4F2 octahedra. In the fifth Mg site, Mg(5) is bonded to one O(10), one O(11), one O(12), one O(9), one F(1), and one F(2) atom to form MgO4F2 octahedra that share  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(3)O6 octahedra,  an edgeedge with one Mg(4)O6 octahedra, edges with two equivalent Mg(1)O4F2 octahedra, and edges with two equivalent Mg(2)O4F2 octahedra. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(13), one O(17), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra, and corners with two equivalent Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-57°. In the second Si site, Si(2) is bonded to one O(14), one O(18), one O(2), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra, and corners with two equivalent Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-56°. In the third Si site, Si(3) is bonded to one O(15), one O(19), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra, and corners with two equivalent Si(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-57°. In the fourth Si site, Si(4) is bonded to one O(16), one O(20), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra, and corners with two equivalent Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-57°. In the fifth Si site, Si(5) is bonded to one O(13), one O(21), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(5)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Si(8)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-61°. In the sixth Si site, Si(6) is bonded to one O(10), one O(14), one O(22), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(5)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Si(7)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-61°. In the seventh Si site, Si(7) is bonded to one O(11), one O(15), one O(22), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O4F2 octahedra,  a cornercorner with one Mg(5)O4F2 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Si(6)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-60°. In the eighth Si site, Si(8) is bonded to one O(12), one O(16), one O(21), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O4F2 octahedra,  a cornercorner with one Mg(5)O4F2 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Si(5)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-60°. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Mg(1), one Mg(3), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Mg(1), one Mg(3), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Mg(2), one Mg(4), and one Si(3) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Mg(2), one Mg(4), and one Si(4) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(1), and one Si(5) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(2), and one Si(6) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one K(1), one Na(1), one Si(3), and one Si(7) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one K(1), one Na(1), one Si(4), and one Si(8) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Mg(1), one Mg(3), one Mg(5), and one Si(5) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Mg(1), one Mg(3), one Mg(5), and one Si(6) atom. In the eleventh O site, O(11) is bonded to one Mg(2), one Mg(4), one Mg(5), and one Si(7) atom to form a mixture of distorted corner and edge-sharing OMg3Si trigonal pyramids. In the twelfth O site, O(12) is bonded to one Mg(2), one Mg(4), one Mg(5), and one Si(8) atom to form a mixture of distorted corner and edge-sharing OMg3Si trigonal pyramids. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(1), and one Si(5) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(2), and one Si(6) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one K(1), one Na(1), one Si(3), and one Si(7) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 150 degrees geometry to one K(1), one Na(1), one Si(4), and one Si(8) atom. In the seventeenth O site, O(17) is bonded in a distorted T-shaped geometry to one Ca(1), one Mg(4), and one Si(1) atom. In the eighteenth O site, O(18) is bonded in a distorted T-shaped geometry to one Ca(1), one Mg(4), and one Si(2) atom. In the nineteenth O site, O(19) is bonded in a distorted T-shaped geometry to one Na(1), one Mg(3), and one Si(3) atom. In the twentieth O site, O(20) is bonded in a distorted T-shaped geometry to one Na(1), one Mg(3), and one Si(4) atom. In the twenty-first O site, O(21) is bonded in a 3-coordinate geometry to one K(1), one Si(5), and one Si(8) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one K(1), one Si(6), and one Si(7) atom. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Mg(2), and one Mg(5) atom. In the second F site, F(2) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Mg(2), and one Mg(5) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_KNaCaMg5Si8(O11F)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.320
_cell_length_b   10.104
_cell_length_c   10.394
_cell_angle_alpha   60.929
_cell_angle_beta   82.943
_cell_angle_gamma   75.359
_symmetry_Int_Tables_number   1
_cell_volume   472.464
_cell_formula_units_Z   1
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  0.975  0.514  0.998  1.0
  Na  Na1  1  0.500  0.723  0.553  1.0
  Ca  Ca2  1  0.500  0.276  0.447  1.0
  Mg  Mg3  1  0.500  0.909  0.182  1.0
  Mg  Mg4  1  0.500  0.089  0.823  1.0
  Mg  Mg5  1  0.000  0.818  0.363  1.0
  Mg  Mg6  1  0.000  0.178  0.645  1.0
  Mg  Mg7  1  1.000  0.000  0.001  1.0
  Si  Si8  1  0.805  0.545  0.344  1.0
  Si  Si9  1  0.195  0.112  0.343  1.0
  Si  Si10  1  0.196  0.458  0.657  1.0
  Si  Si11  1  0.804  0.886  0.656  1.0
  Si  Si12  1  0.299  0.641  0.169  1.0
  Si  Si13  1  0.701  0.190  0.169  1.0
  Si  Si14  1  0.700  0.361  0.830  1.0
  Si  Si15  1  0.300  0.810  0.830  1.0
  O  O16  1  0.729  0.714  0.335  1.0
  O  O17  1  0.271  0.951  0.335  1.0
  O  O18  1  0.275  0.288  0.659  1.0
  O  O19  1  0.724  0.053  0.659  1.0
  O  O20  1  0.591  0.539  0.237  1.0
  O  O21  1  0.410  0.223  0.238  1.0
  O  O22  1  0.407  0.456  0.766  1.0
  O  O23  1  0.594  0.778  0.766  1.0
  O  O24  1  0.219  0.805  0.170  1.0
  O  O25  1  0.781  0.025  0.170  1.0
  O  O26  1  0.782  0.195  0.829  1.0
  O  O27  1  0.218  0.976  0.829  1.0
  O  O28  1  0.097  0.525  0.261  1.0
  O  O29  1  0.903  0.214  0.261  1.0
  O  O30  1  0.908  0.471  0.742  1.0
  O  O31  1  0.092  0.787  0.742  1.0
  O  O32  1  0.797  0.387  0.494  1.0
  O  O33  1  0.203  0.118  0.494  1.0
  O  O34  1  0.201  0.608  0.502  1.0
  O  O35  1  0.799  0.889  0.502  1.0
  O  O36  1  0.305  0.666  0.000  1.0
  O  O37  1  0.696  0.334  0.000  1.0
  F  F38  1  0.714  0.900  1.000  1.0
  F  F39  1  0.287  0.099  1.000  1.0
[/CIF]
.