The material structure described by NaMg3Si4O11F is Esseneite-derived structured and crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a hexagonal planar geometry to one O(1), one O(13), one O(20), one O(22), one O(3), and one O(7) atom. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(12), one O(14), one O(19), one O(2), one O(6), and one O(8) atom. There are six inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(15), one O(18), one O(5), one O(9), 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(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mg(3)O6 octahedra, edges with two equivalent Mg(4)O4F2 octahedra, and edges with two equivalent Mg(6)O4F2 octahedra. In the second Mg site, Mg(2) is bonded to one O(14), one O(18), one O(19), one O(2), one O(6), 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(4)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(1)O4F2 octahedra, and edges with two equivalent Mg(4)O4F2 octahedra. In the third Mg site, Mg(3) is bonded to one O(10), one O(15), one O(17), one O(21), one O(4), and one O(5) 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(5)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, and edges with two equivalent Mg(6)O4F2 octahedra. In the fourth Mg site, Mg(4) is bonded to one O(14), one O(18), one O(6), one O(9), one F(1), and one F(2) atom to form MgO4F2 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(6)O4F2 octahedra, edges with two equivalent Mg(1)O4F2 octahedra, and edges with two equivalent Mg(2)O6 octahedra. In the fifth Mg site, Mg(5) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(16), one O(17), one O(21), and one O(4) atom. In the sixth Mg site, Mg(6) is bonded to one O(10), one O(15), one O(17), one O(5), 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(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  an edgeedge with one Mg(4)O4F2 octahedra, edges with two equivalent Mg(1)O4F2 octahedra, and edges with two equivalent Mg(3)O6 octahedra. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(10), one O(2), one O(20), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(6)O4F2 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra, and corners with two equivalent Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-59°. In the second Si site, Si(2) is bonded to one O(11), one O(22), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(4)O4F2 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra, and corners with two equivalent Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 37-54°. In the third Si site, Si(3) is bonded to one O(1), one O(12), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(6)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Si(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-60°. In the fourth Si site, Si(4) is bonded to one O(16), one O(3), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(4)O4F2 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-62°. In the fifth Si site, Si(5) is bonded to one O(13), one O(15), one O(20), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(6)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Si(6)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(11), one O(13), one O(18), and one O(22) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(4)O4F2 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Si(5)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-62°. In the seventh Si site, Si(7) is bonded to one O(1), one O(12), one O(17), and one O(19) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(6)O4F2 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra, and corners with two equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-59°. In the eighth Si site, Si(8) is bonded to one O(14), one O(16), one O(21), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(4)O4F2 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra, and corners with two equivalent Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 37-54°. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(3), and one Si(7) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Na(2), one Mg(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Na(1), one Si(4), and one Si(8) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Mg(3), one Mg(5), and one Si(2) atom. In the fifth O site, O(5) is bonded to one Mg(1), one Mg(3), one Mg(6), and one Si(3) atom to form a mixture of distorted corner and edge-sharing OMg3Si trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Mg(2), one Mg(4), and one Si(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Si(3), and one Si(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Na(2), one Si(1), and one Si(5) atom. In the ninth O site, O(9) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Mg(4), and one Si(4) atom. In the tenth O site, O(10) is bonded to one Mg(3), one Mg(5), one Mg(6), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OMg3Si trigonal pyramids. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Mg(5), one Si(2), and one Si(6) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Na(2), one Si(3), and one Si(7) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Si(5), and one Si(6) atom. In the fourteenth O site, O(14) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Mg(2), one Mg(4), and one Si(8) atom. In the fifteenth O site, O(15) is bonded to one Mg(1), one Mg(3), one Mg(6), and one Si(5) atom to form a mixture of distorted corner and edge-sharing OMg3Si trigonal pyramids. In the sixteenth O site, O(16) is bonded in a 2-coordinate geometry to one Mg(5), one Si(4), and one Si(8) atom. In the seventeenth O site, O(17) is bonded to one Mg(3), one Mg(5), one Mg(6), and one Si(7) atom to form a mixture of distorted corner and edge-sharing OMg3Si trigonal pyramids. In the eighteenth O site, O(18) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Mg(4), and one Si(6) atom. In the nineteenth O site, O(19) is bonded in a distorted T-shaped geometry to one Na(2), one Mg(2), and one Si(7) atom. In the twentieth O site, O(20) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(1), and one Si(5) atom. In the twenty-first O site, O(21) is bonded in a distorted trigonal non-coplanar geometry to one Mg(3), one Mg(5), and one Si(8) atom. In the twenty-second O site, O(22) is bonded in a 2-coordinate geometry to one Na(1), one Si(2), and one Si(6) 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(4), and one Mg(6) atom. In the second F site, F(2) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Mg(4), and one Mg(6) atom. is represented by the CIF file [CIF]
data_NaMg3Si4O11F
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.356
_cell_length_b   9.783
_cell_length_c   10.279
_cell_angle_alpha   61.613
_cell_angle_beta   84.244
_cell_angle_gamma   77.833
_symmetry_Int_Tables_number   1
_cell_volume   463.154
_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
  Na  Na0  1  0.000  0.498  0.002  1.0
  Na  Na1  1  0.500  0.271  0.460  1.0
  Mg  Mg2  1  0.000  0.001  0.998  1.0
  Mg  Mg3  1  1.000  0.180  0.639  1.0
  Mg  Mg4  1  0.000  0.821  0.357  1.0
  Mg  Mg5  1  0.500  0.090  0.819  1.0
  Mg  Mg6  1  0.500  0.741  0.518  1.0
  Mg  Mg7  1  0.500  0.912  0.177  1.0
  Si  Si8  1  0.216  0.117  0.344  1.0
  Si  Si9  1  0.223  0.464  0.659  1.0
  Si  Si10  1  0.281  0.634  0.168  1.0
  Si  Si11  1  0.272  0.802  0.828  1.0
  Si  Si12  1  0.719  0.197  0.169  1.0
  Si  Si13  1  0.728  0.370  0.829  1.0
  Si  Si14  1  0.784  0.539  0.344  1.0
  Si  Si15  1  0.777  0.878  0.659  1.0
  O  O16  1  0.055  0.531  0.249  1.0
  O  O17  1  0.205  0.110  0.502  1.0
  O  O18  1  0.050  0.771  0.751  1.0
  O  O19  1  0.227  0.624  0.505  1.0
  O  O20  1  0.212  0.804  0.169  1.0
  O  O21  1  0.277  0.291  0.666  1.0
  O  O22  1  0.287  0.654  0.999  1.0
  O  O23  1  0.439  0.222  0.242  1.0
  O  O24  1  0.213  0.970  0.832  1.0
  O  O25  1  0.285  0.943  0.347  1.0
  O  O26  1  0.454  0.478  0.750  1.0
  O  O27  1  0.561  0.536  0.242  1.0
  O  O28  1  0.713  0.346  1.000  1.0
  O  O29  1  0.723  0.043  0.666  1.0
  O  O30  1  0.788  0.027  0.169  1.0
  O  O31  1  0.545  0.773  0.749  1.0
  O  O32  1  0.715  0.710  0.347  1.0
  O  O33  1  0.787  0.199  0.832  1.0
  O  O34  1  0.796  0.388  0.501  1.0
  O  O35  1  0.945  0.220  0.250  1.0
  O  O36  1  0.773  0.871  0.505  1.0
  O  O37  1  0.950  0.478  0.751  1.0
  F  F38  1  0.296  0.102  0.003  1.0
  F  F39  1  0.704  0.895  0.002  1.0
[/CIF]
.
The material structure described by NaMg3Si4O11F is Esseneite-derived structured and crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a hexagonal planar geometry to one O(1), one O(13), one O(20), one O(22), one O(3), and one O(7) atom. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(12), one O(14), one O(19), one O(2), one O(6), and one O(8) atom. There are six inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(15), one O(18), one O(5), one O(9), 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(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mg(3)O6 octahedra, edges with two equivalent Mg(4)O4F2 octahedra, and edges with two equivalent Mg(6)O4F2 octahedra. In the second Mg site, Mg(2) is bonded to one O(14), one O(18), one O(19), one O(2), one O(6), 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(4)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(1)O4F2 octahedra, and edges with two equivalent Mg(4)O4F2 octahedra. In the third Mg site, Mg(3) is bonded to one O(10), one O(15), one O(17), one O(21), one O(4), and one O(5) 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(5)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, and edges with two equivalent Mg(6)O4F2 octahedra. In the fourth Mg site, Mg(4) is bonded to one O(14), one O(18), one O(6), one O(9), one F(1), and one F(2) atom to form MgO4F2 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(6)O4F2 octahedra, edges with two equivalent Mg(1)O4F2 octahedra, and edges with two equivalent Mg(2)O6 octahedra. In the fifth Mg site, Mg(5) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(16), one O(17), one O(21), and one O(4) atom. In the sixth Mg site, Mg(6) is bonded to one O(10), one O(15), one O(17), one O(5), 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(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  an edgeedge with one Mg(4)O4F2 octahedra, edges with two equivalent Mg(1)O4F2 octahedra, and edges with two equivalent Mg(3)O6 octahedra. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(10), one O(2), one O(20), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(6)O4F2 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra, and corners with two equivalent Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-59°. In the second Si site, Si(2) is bonded to one O(11), one O(22), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(4)O4F2 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra, and corners with two equivalent Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 37-54°. In the third Si site, Si(3) is bonded to one O(1), one O(12), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(6)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Si(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-60°. In the fourth Si site, Si(4) is bonded to one O(16), one O(3), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(4)O4F2 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-62°. In the fifth Si site, Si(5) is bonded to one O(13), one O(15), one O(20), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(6)O4F2 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Si(6)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(11), one O(13), one O(18), and one O(22) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4F2 octahedra,  a cornercorner with one Mg(4)O4F2 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Si(5)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-62°. In the seventh Si site, Si(7) is bonded to one O(1), one O(12), one O(17), and one O(19) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(6)O4F2 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra, and corners with two equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-59°. In the eighth Si site, Si(8) is bonded to one O(14), one O(16), one O(21), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(4)O4F2 octahedra,  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra, and corners with two equivalent Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 37-54°. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(3), and one Si(7) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Na(2), one Mg(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Na(1), one Si(4), and one Si(8) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Mg(3), one Mg(5), and one Si(2) atom. In the fifth O site, O(5) is bonded to one Mg(1), one Mg(3), one Mg(6), and one Si(3) atom to form a mixture of distorted corner and edge-sharing OMg3Si trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Mg(2), one Mg(4), and one Si(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Si(3), and one Si(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Na(2), one Si(1), and one Si(5) atom. In the ninth O site, O(9) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Mg(4), and one Si(4) atom. In the tenth O site, O(10) is bonded to one Mg(3), one Mg(5), one Mg(6), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OMg3Si trigonal pyramids. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Mg(5), one Si(2), and one Si(6) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Na(2), one Si(3), and one Si(7) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Si(5), and one Si(6) atom. In the fourteenth O site, O(14) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Mg(2), one Mg(4), and one Si(8) atom. In the fifteenth O site, O(15) is bonded to one Mg(1), one Mg(3), one Mg(6), and one Si(5) atom to form a mixture of distorted corner and edge-sharing OMg3Si trigonal pyramids. In the sixteenth O site, O(16) is bonded in a 2-coordinate geometry to one Mg(5), one Si(4), and one Si(8) atom. In the seventeenth O site, O(17) is bonded to one Mg(3), one Mg(5), one Mg(6), and one Si(7) atom to form a mixture of distorted corner and edge-sharing OMg3Si trigonal pyramids. In the eighteenth O site, O(18) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Mg(4), and one Si(6) atom. In the nineteenth O site, O(19) is bonded in a distorted T-shaped geometry to one Na(2), one Mg(2), and one Si(7) atom. In the twentieth O site, O(20) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(1), and one Si(5) atom. In the twenty-first O site, O(21) is bonded in a distorted trigonal non-coplanar geometry to one Mg(3), one Mg(5), and one Si(8) atom. In the twenty-second O site, O(22) is bonded in a 2-coordinate geometry to one Na(1), one Si(2), and one Si(6) 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(4), and one Mg(6) atom. In the second F site, F(2) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Mg(4), and one Mg(6) atom. is represented by the CIF file [CIF]
data_NaMg3Si4O11F
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.356
_cell_length_b   9.783
_cell_length_c   10.279
_cell_angle_alpha   61.613
_cell_angle_beta   84.244
_cell_angle_gamma   77.833
_symmetry_Int_Tables_number   1
_cell_volume   463.154
_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
  Na  Na0  1  0.000  0.498  0.002  1.0
  Na  Na1  1  0.500  0.271  0.460  1.0
  Mg  Mg2  1  0.000  0.001  0.998  1.0
  Mg  Mg3  1  1.000  0.180  0.639  1.0
  Mg  Mg4  1  0.000  0.821  0.357  1.0
  Mg  Mg5  1  0.500  0.090  0.819  1.0
  Mg  Mg6  1  0.500  0.741  0.518  1.0
  Mg  Mg7  1  0.500  0.912  0.177  1.0
  Si  Si8  1  0.216  0.117  0.344  1.0
  Si  Si9  1  0.223  0.464  0.659  1.0
  Si  Si10  1  0.281  0.634  0.168  1.0
  Si  Si11  1  0.272  0.802  0.828  1.0
  Si  Si12  1  0.719  0.197  0.169  1.0
  Si  Si13  1  0.728  0.370  0.829  1.0
  Si  Si14  1  0.784  0.539  0.344  1.0
  Si  Si15  1  0.777  0.878  0.659  1.0
  O  O16  1  0.055  0.531  0.249  1.0
  O  O17  1  0.205  0.110  0.502  1.0
  O  O18  1  0.050  0.771  0.751  1.0
  O  O19  1  0.227  0.624  0.505  1.0
  O  O20  1  0.212  0.804  0.169  1.0
  O  O21  1  0.277  0.291  0.666  1.0
  O  O22  1  0.287  0.654  0.999  1.0
  O  O23  1  0.439  0.222  0.242  1.0
  O  O24  1  0.213  0.970  0.832  1.0
  O  O25  1  0.285  0.943  0.347  1.0
  O  O26  1  0.454  0.478  0.750  1.0
  O  O27  1  0.561  0.536  0.242  1.0
  O  O28  1  0.713  0.346  1.000  1.0
  O  O29  1  0.723  0.043  0.666  1.0
  O  O30  1  0.788  0.027  0.169  1.0
  O  O31  1  0.545  0.773  0.749  1.0
  O  O32  1  0.715  0.710  0.347  1.0
  O  O33  1  0.787  0.199  0.832  1.0
  O  O34  1  0.796  0.388  0.501  1.0
  O  O35  1  0.945  0.220  0.250  1.0
  O  O36  1  0.773  0.871  0.505  1.0
  O  O37  1  0.950  0.478  0.751  1.0
  F  F38  1  0.296  0.102  0.003  1.0
  F  F39  1  0.704  0.895  0.002  1.0
[/CIF]
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