DOI: 10.17188/1723768
title: Materials Data on Mg2Al16Fe6Si20O73 by Materials Project

description: (MgFe3Al8(Si5O18)2)4O2 crystallizes in the triclinic P1 space group. The structure is three-dimensional and consists of one water molecule and one MgFe3Al8(Si5O18)2 framework. In the MgFe3Al8(Si5O18)2 framework, there are two inequivalent Mg sites. In the first Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with two AlO4 tetrahedra, corners with four SiO4 tetrahedra, an edgeedge with one SiO4 tetrahedra, and edges with two AlO4 tetrahedra. There are three shorter (2.15 Å) and three longer (2.16 Å) Mg–O bond lengths. In the second Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with two AlO4 tetrahedra, corners with four SiO4 tetrahedra, an edgeedge with one SiO4 tetrahedra, and edges with two AlO4 tetrahedra. There are two shorter (2.15 Å) and four longer (2.16 Å) Mg–O bond lengths. There are six inequivalent Fe sites. In the first Fe site, Fe is bonded to six O atoms to form distorted FeO6 octahedra that share corners with two AlO4 tetrahedra, corners with four SiO4 tetrahedra, an edgeedge with one SiO4 tetrahedra, and edges with two AlO4 tetrahedra. There are a spread of Fe–O bond distances ranging from 2.17–2.20 Å. In the second Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two AlO4 tetrahedra, corners with four SiO4 tetrahedra, an edgeedge with one SiO4 tetrahedra, and edges with two AlO4 tetrahedra. There are a spread of Fe–O bond distances ranging from 2.17–2.19 Å. In the third Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two AlO4 tetrahedra, corners with four SiO4 tetrahedra, an edgeedge with one SiO4 tetrahedra, and edges with two AlO4 tetrahedra. There are a spread of Fe–O bond distances ranging from 2.17–2.19 Å. In the fourth Fe site, Fe is bonded to six O atoms to form distorted FeO6 octahedra that share corners with two AlO4 tetrahedra, corners with four SiO4 tetrahedra, an edgeedge with one SiO4 tetrahedra, and edges with two AlO4 tetrahedra. There are a spread of Fe–O bond distances ranging from 2.17–2.20 Å. In the fifth Fe site, Fe is bonded to six O atoms to form distorted FeO6 octahedra that share corners with two AlO4 tetrahedra, corners with four SiO4 tetrahedra, an edgeedge with one SiO4 tetrahedra, and edges with two AlO4 tetrahedra. There are a spread of Fe–O bond distances ranging from 2.17–2.19 Å. In the sixth Fe site, Fe is bonded to six O atoms to form distorted FeO6 octahedra that share corners with two AlO4 tetrahedra, corners with four SiO4 tetrahedra, an edgeedge with one SiO4 tetrahedra, and edges with two AlO4 tetrahedra. There are a spread of Fe–O bond distances ranging from 2.17–2.19 Å. There are sixteen inequivalent Al sites. In the first Al site, Al is bonded to four O atoms to form distorted AlO4 tetrahedra that share corners with four SiO4 tetrahedra and edges with two FeO6 octahedra. All Al–O bond lengths are 1.77 Å. In the second Al site, Al is bonded to four O atoms to form distorted AlO4 tetrahedra that share corners with four SiO4 tetrahedra, an edgeedge with one MgO6 octahedra, and an edgeedge with one FeO6 octahedra. All Al–O bond lengths are 1.77 Å. In the third Al site, Al is bonded to four O atoms to form distorted AlO4 tetrahedra that share corners with four SiO4 tetrahedra, an edgeedge with one MgO6 octahedra, and an edgeedge with one FeO6 octahedra. All Al–O bond lengths are 1.77 Å. In the fourth Al site, Al is bonded to four O atoms to form distorted AlO4 tetrahedra that share corners with four SiO4 tetrahedra and edges with two FeO6 octahedra. All Al–O bond lengths are 1.77 Å. In the fifth Al site, Al is bonded to four O atoms to form distorted AlO4 tetrahedra that share corners with four SiO4 tetrahedra, an edgeedge with one MgO6 octahedra, and an edgeedge with one FeO6 octahedra. There are a spread of Al–O bond distances ranging from 1.76–1.78 Å. In the sixth Al site, Al is bonded to four O atoms to form distorted AlO4 tetrahedra that share corners with four SiO4 tetrahedra and edges with two FeO6 octahedra. There is one shorter (1.76 Å) and three longer (1.77 Å) Al–O bond length. In the seventh Al site, Al is bonded to four O atoms to form distorted AlO4 tetrahedra that share corners with four SiO4 tetrahedra, an edgeedge with one MgO6 octahedra, and an edgeedge with one FeO6 octahedra. All Al–O bond lengths are 1.77 Å. In the eighth Al site, Al is bonded to four O atoms to form distorted AlO4 tetrahedra that share corners with four SiO4 tetrahedra and edges with two FeO6 octahedra. There is two shorter (1.76 Å) and two longer (1.77 Å) Al–O bond length. In the ninth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one MgO6 octahedra, a cornercorner with one FeO6 octahedra, and corners with four SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 48–49°. There are a spread of Al–O bond distances ranging from 1.73–1.80 Å. In the tenth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with two FeO6 octahedra and corners with four SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 48–49°. There is two shorter (1.73 Å) and two longer (1.79 Å) Al–O bond length. In the eleventh Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one MgO6 octahedra, a cornercorner with one FeO6 octahedra, and corners with four SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 48–49°. There are a spread of Al–O bond distances ranging from 1.73–1.80 Å. In the twelfth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with two FeO6 octahedra and corners with four SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 49°. There are a spread of Al–O bond distances ranging from 1.72–1.80 Å. In the thirteenth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with two FeO6 octahedra and corners with four SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 48–49°. There is two shorter (1.73 Å) and two longer (1.79 Å) Al–O bond length. In the fourteenth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one MgO6 octahedra, a cornercorner with one FeO6 octahedra, and corners with four SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 48–49°. There is two shorter (1.73 Å) and two longer (1.79 Å) Al–O bond length. In the fifteenth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one MgO6 octahedra, a cornercorner with one FeO6 octahedra, and corners with four SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 48–49°. There are a spread of Al–O bond distances ranging from 1.73–1.80 Å. In the sixteenth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with two FeO6 octahedra and corners with four SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 49°. There is two shorter (1.73 Å) and two longer (1.79 Å) Al–O bond length. There are twenty inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one MgO6 octahedra, a cornercorner with one FeO6 octahedra, a cornercorner with one SiO4 tetrahedra, and corners with three AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 42–43°. There are a spread of Si–O bond distances ranging from 1.61–1.66 Å. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two FeO6 octahedra, a cornercorner with one SiO4 tetrahedra, and corners with three AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of Si–O bond distances ranging from 1.60–1.66 Å. In the third Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one MgO6 octahedra, a cornercorner with one FeO6 octahedra, a cornercorner with one SiO4 tetrahedra, and corners with three AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 42–43°. There are a spread of Si–O bond distances ranging from 1.61–1.66 Å. In the fourth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two FeO6 octahedra, a cornercorner with one SiO4 tetrahedra, and corners with three AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of Si–O bond distances ranging from 1.60–1.65 Å. In the fifth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one MgO6 octahedra, a cornercorner with one FeO6 octahedra, a cornercorner with one SiO4 tetrahedra, and corners with three AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 42–43°. There are a spread of Si–O bond distances ranging from 1.61–1.66 Å. In the sixth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two FeO6 octahedra, a cornercorner with one SiO4 tetrahedra, and corners with three AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of Si–O bond distances ranging from 1.61–1.66 Å. In the seventh Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one MgO6 octahedra, a cornercorner with one FeO6 octahedra, a cornercorner with one SiO4 tetrahedra, and corners with three AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 42–43°. There are a spread of Si–O bond distances ranging from 1.61–1.66 Å. In the eighth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two FeO6 octahedra, a cornercorner with one SiO4 tetrahedra, and corners with three AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of Si–O bond distances ranging from 1.61–1.66 Å. In the ninth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with four AlO4 tetrahedra, an edgeedge with one MgO6 octahedra, and an edgeedge with one FeO6 octahedra. All Si–O bond lengths are 1.65 Å. In the tenth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with four AlO4 tetrahedra and edges with two FeO6 octahedra. There is two shorter (1.64 Å) and two longer (1.65 Å) Si–O bond length. In the eleventh Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with four AlO4 tetrahedra and edges with two FeO6 octahedra. There is two shorter (1.64 Å) and two longer (1.65 Å) Si–O bond length. In the twelfth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with four AlO4 tetrahedra, an edgeedge with one MgO6 octahedra, and an edgeedge with one FeO6 octahedra. All Si–O bond lengths are 1.65 Å. In the thirteenth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one MgO6 octahedra, a cornercorner with one FeO6 octahedra, a cornercorner with one SiO4 tetrahedra, and corners with three AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 43–44°. There are a spread of Si–O bond distances ranging from 1.59–1.66 Å. In the fourteenth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two FeO6 octahedra, a cornercorner with one SiO4 tetrahedra, and corners with three AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. There are a spread of Si–O bond distances ranging from 1.60–1.66 Å. In the fifteenth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one MgO6 octahedra, a cornercorner with one FeO6 octahedra, a cornercorner with one SiO4 tetrahedra, and corners with three AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 43–44°. There are a spread of Si–O bond distances ranging from 1.60–1.6