DOI: 10.17188/1705663
title: Materials Data on K2Na2Ca4Mg15(SiO3)24 by Materials Project

description: K2Na2Ca4Mg15(SiO3)24 is Esseneite-derived structured and crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are two inequivalent K sites. In the first K site, K is bonded in a 2-coordinate geometry to eight O atoms. There are a spread of K–O bond distances ranging from 2.65–3.04 Å. In the second K site, K is bonded in a 2-coordinate geometry to ten O atoms. There are a spread of K–O bond distances ranging from 2.64–3.34 Å. Na is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Na–O bond distances ranging from 2.44–2.94 Å. There are two inequivalent Ca sites. In the first Ca site, Ca is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Ca–O bond distances ranging from 2.36–2.86 Å. In the second Ca site, Ca is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Ca–O bond distances ranging from 2.36–2.86 Å. There are nine inequivalent Mg sites. In the first Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with six SiO4 tetrahedra and edges with three MgO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.03–2.14 Å. In the second Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with six SiO4 tetrahedra and edges with three MgO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.02–2.19 Å. In the third Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with six SiO4 tetrahedra and edges with three MgO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.02–2.19 Å. In the fourth Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with four SiO4 tetrahedra and edges with six MgO6 octahedra. There are two shorter (2.09 Å) and four longer (2.11 Å) Mg–O bond lengths. In the fifth Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with four SiO4 tetrahedra and edges with six MgO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.09–2.11 Å. In the sixth Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with four SiO4 tetrahedra and edges with six MgO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.09–2.11 Å. In the seventh Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with four SiO4 tetrahedra and edges with five MgO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.05–2.12 Å. In the eighth Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with four SiO4 tetrahedra and edges with five MgO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.05–2.12 Å. In the ninth Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with four SiO4 tetrahedra and edges with five MgO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.04–2.11 Å. There are twelve inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three MgO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 58–61°. There are a spread of Si–O bond distances ranging from 1.62–1.66 Å. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three MgO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 58–61°. There are a spread of Si–O bond distances ranging from 1.62–1.65 Å. In the third Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three MgO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 58–61°. 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 three MgO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 58–61°. There are a spread of Si–O bond distances ranging from 1.62–1.66 Å. In the fifth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three MgO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 58–61°. 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 three MgO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 58–61°. There are a spread of Si–O bond distances ranging from 1.62–1.66 Å. In the seventh Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three MgO6 octahedra and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 35–58°. There are a spread of Si–O bond distances ranging from 1.61–1.70 Å. In the eighth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three MgO6 octahedra and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 32–57°. There are a spread of Si–O bond distances ranging from 1.60–1.70 Å. In the ninth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three MgO6 octahedra and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 33–55°. There are a spread of Si–O bond distances ranging from 1.61–1.70 Å. In the tenth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three MgO6 octahedra and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 35–58°. There are a spread of Si–O bond distances ranging from 1.60–1.70 Å. In the eleventh Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three MgO6 octahedra and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 33–55°. There are a spread of Si–O bond distances ranging from 1.61–1.70 Å. In the twelfth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three MgO6 octahedra and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 32–57°. There are a spread of Si–O bond distances ranging from 1.59–1.70 Å. There are forty-two inequivalent O sites. In the first O site, O is bonded in a distorted rectangular see-saw-like geometry to one Ca, two Mg, and one Si atom. In the second O site, O is bonded in a distorted rectangular see-saw-like geometry to one Na, two Mg, and one Si atom. In the third O site, O is bonded in a distorted rectangular see-saw-like geometry to one Ca, two Mg, and one Si atom. In the fourth O site, O is bonded in a 2-coordinate geometry to one Ca and two Si atoms. In the fifth O site, O is bonded in a 2-coordinate geometry to one K, one Na, and two Si atoms. In the sixth O site, O is bonded in a 3-coordinate geometry to one Ca and two Si atoms. In the seventh O site, O is bonded in a 2-coordinate geometry to one K, one Ca, and two Si atoms. In the eighth O site, O is bonded in a 3-coordinate geometry to one Ca and two Si atoms. In the ninth O site, O is bonded in a 2-coordinate geometry to one K, one Na, and two Si atoms. In the tenth O site, O is bonded in a 2-coordinate geometry to one Ca and two Si atoms. In the eleventh O site, O is bonded in a distorted bent 150 degrees geometry to one K, one Na, and two Si atoms. In the twelfth O site, O is bonded in a 2-coordinate geometry to one K, one Ca, and two Si atoms. In the thirteenth O site, O is bonded in a 2-coordinate geometry to one Ca and two Si atoms. In the fourteenth O site, O is bonded in a 2-coordinate geometry to one K, one Ca, and two Si atoms. In the fifteenth O site, O is bonded in a distorted bent 150 degrees geometry to one K, one Na, and two Si atoms. In the sixteenth O site, O is bonded in a 2-coordinate geometry to one K and two equivalent Si atoms. In the seventeenth O site, O is bonded in a bent 150 degrees geometry to two equivalent Si atoms. In the eighteenth O site, O is bonded in a 2-coordinate geometry to one K and two equivalent Si atoms. In the nineteenth O site, O is bonded in a bent 150 degrees geometry to two equivalent Si atoms. In the twentieth O site, O is bonded in a 2-coordinate geometry to one K and two equivalent Si atoms. In the twenty-first O site, O is bonded in a 2-coordinate geometry to one K and two equivalent Si atoms. In the twenty-second O site, O is bonded in a trigonal non-coplanar geometry to three Mg atoms. In the twenty-third O site, O is bonded in a trigonal non-coplanar geometry to three Mg atoms. In the twenty-fourth O site, O is bonded in a trigonal non-coplanar geometry to three Mg atoms. In the twenty-fifth O site, O is bonded in a trigonal non-coplanar geometry to three Mg atoms. In the twenty-sixth O site, O is bonded in a trigonal non-coplanar geometry to three Mg atoms. In the twenty-seventh O site, O is bonded in a trigonal non-coplanar geometry to three Mg atoms. In the twenty-eighth O site, O is bonded in a distorted T-shaped geometry to one Ca, one Mg, and one Si atom. In the twenty-ninth O site, O is bonded in a distorted T-shaped geometry to one Na, one Mg, and one Si atom. In the thirtieth O site, O is bonded in a distorted T-shaped geometry to one Ca, one Mg, and one Si atom. In the thirty-first O site, O is bonded in a distorted T-shaped geometry to one Ca, one Mg, and one Si atom. In the thirty-second O site, O is bonded in a distorted T-shaped geometry to one Ca, one Mg, and one Si atom. In the thirty-third O site, O is bonded in a distorted T-shaped geometry to one Na, one Mg, and one Si atom. In the thirty-fourth O site, O is bonded to three Mg and one Si atom to form distorted corner-sharing OMg3Si trigonal pyramids. In the thirty-fifth O site, O is bonded to three Mg and one Si atom to form a mixture of distorted edge and corner-sharing OMg3Si trigonal pyramids. In the thirty-sixth O site, O is bonded to three Mg and one Si atom to form a mixture of distorted edge and corner-sharing OMg3Si trigonal pyramids. In the thirty-seventh O site, O is bonded to three Mg and one Si atom to form a mixture of distorted edge and corner-sharing OMg3Si trigonal pyramids. In the thirty-eighth O site, O is bonded in a distorted rectangular see-saw-like geometry to three Mg and one Si atom. In the thirty-ninth O site, O is bonded to three Mg and one Si atom to form a mixture of distorted edge and corner-sharing OMg3Si trigonal pyramids. In the fortieth O site, O is bonded in a distorted rectangular see-saw-like geometry to one Ca, two Mg, and one Si atom. In the forty-first O site, O is bonded in a distorted rectangular see-saw-like geometry to one Ca, two Mg, and one Si atom. In the forty-second O site, O is bonded in a distorted rectangular see-saw-like geometry to one Na, two Mg, and one Si atom.