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Ca6Fe4Al2O15 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are twenty-one inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.34–2.96 Å. In the second Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.32–2.97 Å. In the third Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–3.00 Å. In the fourth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.31–2.96 Å. In the fifth Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.32–3.01 Å. In the sixth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.31–2.96 Å. In the seventh Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.31–2.89 Å. In the eighth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.31–2.89 Å. In the ninth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.32–2.90 Å. In the tenth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.32–2.90 Å. In the eleventh Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.32–2.90 Å. In the twelfth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.90 Å. In the thirteenth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.31–2.89 Å. In the fourteenth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.32–2.90 Å. In the fifteenth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.31–2.89 Å. In the sixteenth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.90 Å. In the seventeenth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.32–2.90 Å. In the eighteenth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.32–2.90 Å. In the nineteenth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.34–2.96 Å. In the twentieth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.32–2.97 Å. In the twenty-first Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.31–2.96 Å. There are fifteen inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four FeO6 octahedra, a cornercorner with one FeO4 tetrahedra, and a cornercorner with one AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 13–14°. There are a spread of Fe–O bond distances ranging from 1.98–2.16 Å. In the second Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four FeO6 octahedra, a cornercorner with one FeO4 tetrahedra, and a cornercorner with one AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 12–14°. There are a spread of Fe–O bond distances ranging from 1.99–2.16 Å. In the third Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four FeO6 octahedra, a cornercorner with one FeO4 tetrahedra, and a cornercorner with one AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 12–13°. There are a spread of Fe–O bond distances ranging from 1.98–2.16 Å. In the fourth Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four FeO6 octahedra and corners with two AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 12–14°. There are a spread of Fe–O bond distances ranging from 1.98–2.19 Å. In the fifth Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four FeO6 octahedra, a cornercorner with one FeO4 tetrahedra, and a cornercorner with one AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 13–14°. There are a spread of Fe–O bond distances ranging from 1.98–2.16 Å. In the sixth Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four FeO6 octahedra and corners with two AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 12–13°. There are a spread of Fe–O bond distances ranging from 1.98–2.18 Å. In the seventh Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four FeO6 octahedra, a cornercorner with one FeO4 tetrahedra, and a cornercorner with one AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 12–13°. There are a spread of Fe–O bond distances ranging from 1.98–2.16 Å. In the eighth Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four FeO6 octahedra, a cornercorner with one FeO4 tetrahedra, and a cornercorner with one AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 13–14°. There are a spread of Fe–O bond distances ranging from 1.98–2.16 Å. In the ninth Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four FeO6 octahedra, a cornercorner with one FeO4 tetrahedra, and a cornercorner with one AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 12–14°. There are a spread of Fe–O bond distances ranging from 1.99–2.16 Å. In the tenth Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four FeO6 octahedra and corners with two AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 12–14°. There are a spread of Fe–O bond distances ranging from 1.98–2.19 Å. In the eleventh Fe3+ site, Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four FeO6 octahedra and corners with two AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 12–13°. There are a spread of Fe–O bond distances ranging from 1.98–2.18 Å. In the twelfth Fe3+ site, Fe3+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with two FeO6 octahedra and corners with two equivalent FeO4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of Fe–O bond distances ranging from 1.87–1.97 Å. In the thirteenth Fe3+ site, Fe3+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with two FeO6 octahedra and corners with two equivalent AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. There are a spread of Fe–O bond distances ranging from 1.87–1.97 Å. In the fourteenth Fe3+ site, Fe3+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with two FeO6 octahedra and corners with two equivalent AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of Fe–O bond distances ranging from 1.87–1.97 Å. In the fifteenth Fe3+ site, Fe3+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with two equivalent FeO6 octahedra and corners with two equivalent FeO4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of Fe–O bond distances ranging from 1.87–1.97 Å. There are eight inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two FeO6 octahedra and corners with two equivalent FeO4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. There are a spread of Al–O bond distances ranging from 1.77–1.83 Å. In the second Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two FeO6 octahedra and corners with two equivalent FeO4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. There are a spread of Al–O bond distances ranging from 1.77–1.83 Å. In the third Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two FeO6 octahedra and corners with two equivalent AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of Al–O bond distances ranging from 1.76–1.83 Å. In the fourth Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two FeO6 octahedra and corners with two equivalent AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of Al–O bond distances ranging from 1.76–1.83 Å. In the fifth Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two FeO6 octahedra and corners with two equivalent AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of Al–O bond distances ranging from 1.76–1.83 Å. In the sixth Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two FeO6 octahedra and corners with two equivalent AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. There are a spread of Al–O bond distances ranging from 1.76–1.84 Å. In the seventh Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two FeO6 octahedra and corners with two equivalent AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 42–43°. There are a spread of Al–O bond distances ranging from 1.76–1.84 Å. In the eighth Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two FeO6 octahedra and corners with two equivalent AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 42–43°. There are a spread of Al–O bond distances ranging from 1.76–1.84 Å. There are sixty inequivalent O2- sites. In the first O2- site, O2- is bonded in a 6-coordinate geometry to four Ca2+ and two Fe3+ atoms. The O–Ca bond length is 2.66 Å. The O–Fe bond length is 1.98 Å. In the second O2- site, O2- is bonded in a 6-coordinate geometry to four Ca2+ and two Fe3+ atoms. The O–Ca bond length is 2.66 Å. In the third O2- site, O2- is bonded in a 6-coordinate geometry to four Ca2+ and two Fe3+ atoms. In the fourth O2- site, O2- is bonded in a 6-coordinate geometry to four Ca2+ and two Fe3+ atoms. In the fifth O2- site, O2- is bonded in a 6-coordinate geometry to four Ca2+ and two Fe3+ atoms. In the sixth O2- site, O2- is bonded to four Ca2+ and two Fe3+ atoms to form distorted OCa4Fe2 octahedra that share a cornercorner with one OCa4Fe2 octahedra, corners with four OCa2Fe2 tetrahedra, an edgeedge with one OCa4Fe2 octahedra, and a faceface with one OCa4Fe2 octahedra. The corner-sharing octahedral tilt angles are 1°. The O–Ca bond length is 2.63 Å. In the seventh O2- site, O2- is bonded to four Ca2+ and two Fe3+ atoms to form distorted OCa4Fe2 octahedra that share corners with four OCa2AlFe tetrahedra and faces with three OCa4Fe2 octahedra. In the eighth O2- site, O2- is bonded to four Ca2+ and two Fe3+ atoms to form distorted corner-sharing OCa4Fe2 octahedra. In the ninth O2- site, O2- is bonded in a 6-coordinate geometry to four Ca2+ and t

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