The material structure described by Mg3Fe(SiO4)2 is Hausmannite-derived structured and crystallizes in the orthorhombic Pmc2_1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(4), one O(6), two equivalent O(1), and two equivalent O(2) atoms to form MgO6 octahedra that share corners with four equivalent Mg(2)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, edges with two equivalent Mg(2)O6 octahedra, and  an edgeedge with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-62°. In the second Mg site, Mg(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra,  an edgeedge with one Si(1)O4 tetrahedra, and  an edgeedge with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-65°. Fe(1) is bonded to one O(3), one O(5), two equivalent O(1), and two equivalent O(2) atoms to form FeO6 octahedra that share corners with four equivalent Mg(1)O6 octahedra, corners with four equivalent Mg(2)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, edges with two equivalent Mg(2)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-65°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(3), one O(5), and two equivalent O(1) atoms to form SiO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, and edges with two equivalent Mg(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-65°. In the second Si site, Si(2) is bonded to one O(4), one O(6), and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, and edges with two equivalent Mg(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-61°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Fe(1), and one Si(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Fe(1), and one Si(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Mg(2), one Fe(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal pyramidal geometry to one Mg(1), two equivalent Mg(2), and one Si(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(2), one Fe(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent Mg(2), and one Si(2) atom. is represented by the CIF file [CIF]
data_Mg3Fe(SiO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.805
_cell_length_b   6.098
_cell_length_c   10.425
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   305.489
_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
  Mg  Mg0  1  0.257  0.000  0.222  1.0
  Mg  Mg1  1  0.743  0.000  0.722  1.0
  Mg  Mg2  1  0.250  0.750  0.500  1.0
  Mg  Mg3  1  0.750  0.250  0.000  1.0
  Mg  Mg4  1  0.250  0.250  0.500  1.0
  Mg  Mg5  1  0.750  0.750  0.000  1.0
  Fe  Fe6  1  0.236  0.500  0.779  1.0
  Fe  Fe7  1  0.764  0.500  0.279  1.0
  Si  Si8  1  0.675  0.500  0.595  1.0
  Si  Si9  1  0.325  0.500  0.095  1.0
  Si  Si10  1  0.822  0.000  0.407  1.0
  Si  Si11  1  0.178  0.000  0.907  1.0
  O  O12  1  0.531  0.719  0.662  1.0
  O  O13  1  0.469  0.281  0.162  1.0
  O  O14  1  0.973  0.213  0.337  1.0
  O  O15  1  0.027  0.787  0.837  1.0
  O  O16  1  0.973  0.787  0.337  1.0
  O  O17  1  0.027  0.213  0.837  1.0
  O  O18  1  0.531  0.281  0.662  1.0
  O  O19  1  0.469  0.719  0.162  1.0
  O  O20  1  0.015  0.500  0.588  1.0
  O  O21  1  0.985  0.500  0.088  1.0
  O  O22  1  0.482  0.000  0.408  1.0
  O  O23  1  0.518  0.000  0.908  1.0
  O  O24  1  0.477  0.500  0.951  1.0
  O  O25  1  0.523  0.500  0.451  1.0
  O  O26  1  0.029  0.000  0.052  1.0
  O  O27  1  0.971  0.000  0.552  1.0
[/CIF]
.
The material structure described by Mg3Fe(SiO4)2 is Hausmannite-derived structured and crystallizes in the orthorhombic Pmc2_1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(4), one O(6), two equivalent O(1), and two equivalent O(2) atoms to form MgO6 octahedra that share corners with four equivalent Mg(2)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, edges with two equivalent Mg(2)O6 octahedra, and  an edgeedge with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-62°. In the second Mg site, Mg(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra,  an edgeedge with one Si(1)O4 tetrahedra, and  an edgeedge with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-65°. Fe(1) is bonded to one O(3), one O(5), two equivalent O(1), and two equivalent O(2) atoms to form FeO6 octahedra that share corners with four equivalent Mg(1)O6 octahedra, corners with four equivalent Mg(2)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, edges with two equivalent Mg(2)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-65°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(3), one O(5), and two equivalent O(1) atoms to form SiO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, and edges with two equivalent Mg(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-65°. In the second Si site, Si(2) is bonded to one O(4), one O(6), and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, and edges with two equivalent Mg(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-61°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Fe(1), and one Si(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Fe(1), and one Si(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Mg(2), one Fe(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal pyramidal geometry to one Mg(1), two equivalent Mg(2), and one Si(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(2), one Fe(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent Mg(2), and one Si(2) atom. is represented by the CIF file [CIF]
data_Mg3Fe(SiO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.805
_cell_length_b   6.098
_cell_length_c   10.425
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   305.489
_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
  Mg  Mg0  1  0.257  0.000  0.222  1.0
  Mg  Mg1  1  0.743  0.000  0.722  1.0
  Mg  Mg2  1  0.250  0.750  0.500  1.0
  Mg  Mg3  1  0.750  0.250  0.000  1.0
  Mg  Mg4  1  0.250  0.250  0.500  1.0
  Mg  Mg5  1  0.750  0.750  0.000  1.0
  Fe  Fe6  1  0.236  0.500  0.779  1.0
  Fe  Fe7  1  0.764  0.500  0.279  1.0
  Si  Si8  1  0.675  0.500  0.595  1.0
  Si  Si9  1  0.325  0.500  0.095  1.0
  Si  Si10  1  0.822  0.000  0.407  1.0
  Si  Si11  1  0.178  0.000  0.907  1.0
  O  O12  1  0.531  0.719  0.662  1.0
  O  O13  1  0.469  0.281  0.162  1.0
  O  O14  1  0.973  0.213  0.337  1.0
  O  O15  1  0.027  0.787  0.837  1.0
  O  O16  1  0.973  0.787  0.337  1.0
  O  O17  1  0.027  0.213  0.837  1.0
  O  O18  1  0.531  0.281  0.662  1.0
  O  O19  1  0.469  0.719  0.162  1.0
  O  O20  1  0.015  0.500  0.588  1.0
  O  O21  1  0.985  0.500  0.088  1.0
  O  O22  1  0.482  0.000  0.408  1.0
  O  O23  1  0.518  0.000  0.908  1.0
  O  O24  1  0.477  0.500  0.951  1.0
  O  O25  1  0.523  0.500  0.451  1.0
  O  O26  1  0.029  0.000  0.052  1.0
  O  O27  1  0.971  0.000  0.552  1.0
[/CIF]
.