RbCaMg14 crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded to two equivalent Ca(1); two equivalent Mg(7); four Mg(3,3,3,3); and four Mg(5,5) atoms to form RbCa2Mg10 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra; corners with six equivalent Rb(1)Ca2Mg10 cuboctahedra; corners with eight equivalent Mg(4)Mg12 cuboctahedra; edges with two equivalent Ca(1)Rb2Mg10 cuboctahedra; edges with eight Mg(5,5)RbCaMg10 cuboctahedra; faces with two equivalent Ca(1)Rb2Mg10 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with four Mg(5,5)RbCaMg10 cuboctahedra; and faces with six equivalent Mg(6)CaMg11 cuboctahedra. Ca(1) is bonded to two equivalent Rb(1); two equivalent Mg(6); four Mg(3,3,3,3); and four Mg(5,5) atoms to form CaRb2Mg10 cuboctahedra that share corners with four equivalent Mg(2)Mg12 cuboctahedra; corners with six equivalent Ca(1)Rb2Mg10 cuboctahedra; corners with eight equivalent Mg(4)Mg12 cuboctahedra; edges with two equivalent Rb(1)Ca2Mg10 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with eight Mg(5,5)RbCaMg10 cuboctahedra; faces with two equivalent Rb(1)Ca2Mg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; and faces with four Mg(5,5)RbCaMg10 cuboctahedra. There are eleven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2); two equivalent Mg(6); four equivalent Mg(4); and four Mg(5,5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Rb(1)Ca2Mg10 cuboctahedra; corners with six equivalent Mg(1)Mg12 cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with eight Mg(5,5)RbCaMg10 cuboctahedra; faces with two equivalent Ca(1)Rb2Mg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with four equivalent Mg(4)Mg12 cuboctahedra; and faces with four Mg(5,5)RbCaMg10 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1); two equivalent Mg(7); four equivalent Mg(4); and four Mg(5,5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Ca(1)Rb2Mg10 cuboctahedra; corners with six equivalent Mg(2)Mg12 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with eight Mg(5,5)RbCaMg10 cuboctahedra; faces with two equivalent Rb(1)Ca2Mg10 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with four equivalent Mg(4)Mg12 cuboctahedra; faces with four Mg(5,5)RbCaMg10 cuboctahedra; and faces with six equivalent Mg(6)CaMg11 cuboctahedra. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Rb(1), two equivalent Ca(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms. In the fourth Mg site, Mg(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Rb(1)Ca2Mg10 cuboctahedra; corners with four equivalent Ca(1)Rb2Mg10 cuboctahedra; corners with six equivalent Mg(4)Mg12 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with two equivalent Mg(4)Mg12 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with four Mg(5,5)RbCaMg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; and faces with eight Mg(5,5)RbCaMg10 cuboctahedra. In the fifth Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Rb(1); two equivalent Ca(1); two equivalent Mg(3); two Mg(5,5); two equivalent Mg(6); and two equivalent Mg(7) atoms. In the sixth Mg site, Mg(5) is bonded to one Rb(1), one Ca(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms to form distorted MgRbCaMg10 cuboctahedra that share corners with four equivalent Mg(6)CaMg11 cuboctahedra; corners with ten Mg(5,5)RbCaMg10 cuboctahedra; edges with two equivalent Rb(1)Ca2Mg10 cuboctahedra; edges with two equivalent Ca(1)Rb2Mg10 cuboctahedra; edges with two equivalent Mg(6)CaMg11 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with two equivalent Mg(4)Mg12 cuboctahedra; edges with two equivalent Mg(5)RbCaMg10 cuboctahedra;  a faceface with one Rb(1)Ca2Mg10 cuboctahedra;  a faceface with one Ca(1)Rb2Mg10 cuboctahedra;  a faceface with one Mg(1)Mg12 cuboctahedra;  a faceface with one Mg(2)Mg12 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with four equivalent Mg(4)Mg12 cuboctahedra; and faces with four Mg(5,5)RbCaMg10 cuboctahedra. In the seventh Mg site, Mg(5) is bonded to one Rb(1), one Ca(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms to form distorted MgRbCaMg10 cuboctahedra that share corners with four equivalent Mg(6)CaMg11 cuboctahedra, corners with ten equivalent Mg(5)RbCaMg10 cuboctahedra, edges with two equivalent Rb(1)Ca2Mg10 cuboctahedra, edges with two equivalent Ca(1)Rb2Mg10 cuboctahedra, edges with two equivalent Mg(6)CaMg11 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Mg(5)RbCaMg10 cuboctahedra,  a faceface with one Rb(1)Ca2Mg10 cuboctahedra,  a faceface with one Ca(1)Rb2Mg10 cuboctahedra,  a faceface with one Mg(1)Mg12 cuboctahedra,  a faceface with one Mg(2)Mg12 cuboctahedra, faces with two equivalent Mg(6)CaMg11 cuboctahedra, faces with four equivalent Mg(4)Mg12 cuboctahedra, and faces with four equivalent Mg(5)RbCaMg10 cuboctahedra. In the eighth Mg site, Mg(6) is bonded to one Ca(1); one Mg(1); two Mg(3,3); two equivalent Mg(4); two equivalent Mg(7); and four Mg(5,5) atoms to form distorted MgCaMg11 cuboctahedra that share corners with six equivalent Mg(6)CaMg11 cuboctahedra; corners with eight Mg(5,5)RbCaMg10 cuboctahedra; edges with two equivalent Ca(1)Rb2Mg10 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with four Mg(5,5)RbCaMg10 cuboctahedra;  a faceface with one Ca(1)Rb2Mg10 cuboctahedra;  a faceface with one Mg(1)Mg12 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with three equivalent Rb(1)Ca2Mg10 cuboctahedra; faces with three equivalent Mg(2)Mg12 cuboctahedra; and faces with four Mg(5,5)RbCaMg10 cuboctahedra. In the ninth Mg site, Mg(7) is bonded in a 12-coordinate geometry to one Rb(1); one Mg(2); two Mg(3,3); two equivalent Mg(4); two equivalent Mg(6); and four Mg(5,5) atoms. In the tenth Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Rb(1); two equivalent Ca(1); two equivalent Mg(3); two Mg(5,5); two equivalent Mg(6); and two equivalent Mg(7) atoms. In the eleventh Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Rb(1), two equivalent Ca(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms.
RbCaMg14 crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded to two equivalent Ca(1); two equivalent Mg(7); four Mg(3,3,3,3); and four Mg(5,5) atoms to form RbCa2Mg10 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra; corners with six equivalent Rb(1)Ca2Mg10 cuboctahedra; corners with eight equivalent Mg(4)Mg12 cuboctahedra; edges with two equivalent Ca(1)Rb2Mg10 cuboctahedra; edges with eight Mg(5,5)RbCaMg10 cuboctahedra; faces with two equivalent Ca(1)Rb2Mg10 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with four Mg(5,5)RbCaMg10 cuboctahedra; and faces with six equivalent Mg(6)CaMg11 cuboctahedra. Both Rb(1)-Ca(1) bond lengths are 3.34 Å. Both Rb(1)-Mg(7) bond lengths are 3.49 Å. There are two shorter (3.32 Å) and two longer (3.35 Å) Rb(1)-Mg(3,3,3,3) bond lengths. All Rb(1)-Mg(5,5) bond lengths are 3.54 Å. Ca(1) is bonded to two equivalent Rb(1); two equivalent Mg(6); four Mg(3,3,3,3); and four Mg(5,5) atoms to form CaRb2Mg10 cuboctahedra that share corners with four equivalent Mg(2)Mg12 cuboctahedra; corners with six equivalent Ca(1)Rb2Mg10 cuboctahedra; corners with eight equivalent Mg(4)Mg12 cuboctahedra; edges with two equivalent Rb(1)Ca2Mg10 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with eight Mg(5,5)RbCaMg10 cuboctahedra; faces with two equivalent Rb(1)Ca2Mg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; and faces with four Mg(5,5)RbCaMg10 cuboctahedra. Both Ca(1)-Mg(6) bond lengths are 3.40 Å. There are two shorter (3.29 Å) and two longer (3.38 Å) Ca(1)-Mg(3,3,3,3) bond lengths. All Ca(1)-Mg(5,5) bond lengths are 3.48 Å. There are eleven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2); two equivalent Mg(6); four equivalent Mg(4); and four Mg(5,5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Rb(1)Ca2Mg10 cuboctahedra; corners with six equivalent Mg(1)Mg12 cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with eight Mg(5,5)RbCaMg10 cuboctahedra; faces with two equivalent Ca(1)Rb2Mg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with four equivalent Mg(4)Mg12 cuboctahedra; and faces with four Mg(5,5)RbCaMg10 cuboctahedra. Both Mg(1)-Mg(2) bond lengths are 3.34 Å. Both Mg(1)-Mg(6) bond lengths are 3.30 Å. There are two shorter (3.30 Å) and two longer (3.37 Å) Mg(1)-Mg(4) bond lengths. All Mg(1)-Mg(5,5) bond lengths are 3.15 Å. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1); two equivalent Mg(7); four equivalent Mg(4); and four Mg(5,5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Ca(1)Rb2Mg10 cuboctahedra; corners with six equivalent Mg(2)Mg12 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with eight Mg(5,5)RbCaMg10 cuboctahedra; faces with two equivalent Rb(1)Ca2Mg10 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with four equivalent Mg(4)Mg12 cuboctahedra; faces with four Mg(5,5)RbCaMg10 cuboctahedra; and faces with six equivalent Mg(6)CaMg11 cuboctahedra. Both Mg(2)-Mg(7) bond lengths are 3.26 Å. There are two shorter (3.32 Å) and two longer (3.35 Å) Mg(2)-Mg(4) bond lengths. All Mg(2)-Mg(5,5) bond lengths are 3.19 Å. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Rb(1), two equivalent Ca(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms. There is one shorter (3.32 Å) and one longer (3.36 Å) Mg(3)-Mg(3) bond length. Both Mg(3)-Mg(5) bond lengths are 3.47 Å. Both Mg(3)-Mg(6) bond lengths are 3.34 Å. Both Mg(3)-Mg(7) bond lengths are 3.42 Å. In the fourth Mg site, Mg(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Rb(1)Ca2Mg10 cuboctahedra; corners with four equivalent Ca(1)Rb2Mg10 cuboctahedra; corners with six equivalent Mg(4)Mg12 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with two equivalent Mg(4)Mg12 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with four Mg(5,5)RbCaMg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; and faces with eight Mg(5,5)RbCaMg10 cuboctahedra. There is one shorter (3.32 Å) and one longer (3.35 Å) Mg(4)-Mg(4) bond length. Both Mg(4)-Mg(5) bond lengths are 3.13 Å. Both Mg(4)-Mg(6) bond lengths are 3.28 Å. Both Mg(4)-Mg(7) bond lengths are 3.19 Å. In the fifth Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Rb(1); two equivalent Ca(1); two equivalent Mg(3); two Mg(5,5); two equivalent Mg(6); and two equivalent Mg(7) atoms. There is one shorter (3.32 Å) and one longer (3.36 Å) Mg(3)-Mg(3) bond length. Both Mg(3)-Mg(5,5) bond lengths are 3.47 Å. Both Mg(3)-Mg(6) bond lengths are 3.34 Å. Both Mg(3)-Mg(7) bond lengths are 3.42 Å. In the sixth Mg site, Mg(5) is bonded to one Rb(1), one Ca(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms to form distorted MgRbCaMg10 cuboctahedra that share corners with four equivalent Mg(6)CaMg11 cuboctahedra; corners with ten Mg(5,5)RbCaMg10 cuboctahedra; edges with two equivalent Rb(1)Ca2Mg10 cuboctahedra; edges with two equivalent Ca(1)Rb2Mg10 cuboctahedra; edges with two equivalent Mg(6)CaMg11 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with two equivalent Mg(4)Mg12 cuboctahedra; edges with two equivalent Mg(5)RbCaMg10 cuboctahedra;  a faceface with one Rb(1)Ca2Mg10 cuboctahedra;  a faceface with one Ca(1)Rb2Mg10 cuboctahedra;  a faceface with one Mg(1)Mg12 cuboctahedra;  a faceface with one Mg(2)Mg12 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with four equivalent Mg(4)Mg12 cuboctahedra; and faces with four Mg(5,5)RbCaMg10 cuboctahedra. There is one shorter (3.25 Å) and one longer (3.42 Å) Mg(5)-Mg(5) bond length. There is one shorter (3.29 Å) and one longer (3.39 Å) Mg(5)-Mg(6) bond length. There is one shorter (3.20 Å) and one longer (3.48 Å) Mg(5)-Mg(7) bond length. In the seventh Mg site, Mg(5) is bonded to one Rb(1), one Ca(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms to form distorted MgRbCaMg10 cuboctahedra that share corners with four equivalent Mg(6)CaMg11 cuboctahedra, corners with ten equivalent Mg(5)RbCaMg10 cuboctahedra, edges with two equivalent Rb(1)Ca2Mg10 cuboctahedra, edges with two equivalent Ca(1)Rb2Mg10 cuboctahedra, edges with two equivalent Mg(6)CaMg11 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Mg(5)RbCaMg10 cuboctahedra,  a faceface with one Rb(1)Ca2Mg10 cuboctahedra,  a faceface with one Ca(1)Rb2Mg10 cuboctahedra,  a faceface with one Mg(1)Mg12 cuboctahedra,  a faceface with one Mg(2)Mg12 cuboctahedra, faces with two equivalent Mg(6)CaMg11 cuboctahedra, faces with four equivalent Mg(4)Mg12 cuboctahedra, and faces with four equivalent Mg(5)RbCaMg10 cuboctahedra. The Mg(5)-Mg(4) bond length is 3.13 Å. There is one shorter (3.29 Å) and one longer (3.39 Å) Mg(5)-Mg(6) bond length. There is one shorter (3.20 Å) and one longer (3.48 Å) Mg(5)-Mg(7) bond length. In the eighth Mg site, Mg(6) is bonded to one Ca(1); one Mg(1); two Mg(3,3); two equivalent Mg(4); two equivalent Mg(7); and four Mg(5,5) atoms to form distorted MgCaMg11 cuboctahedra that share corners with six equivalent Mg(6)CaMg11 cuboctahedra; corners with eight Mg(5,5)RbCaMg10 cuboctahedra; edges with two equivalent Ca(1)Rb2Mg10 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with four Mg(5,5)RbCaMg10 cuboctahedra;  a faceface with one Ca(1)Rb2Mg10 cuboctahedra;  a faceface with one Mg(1)Mg12 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with three equivalent Rb(1)Ca2Mg10 cuboctahedra; faces with three equivalent Mg(2)Mg12 cuboctahedra; and faces with four Mg(5,5)RbCaMg10 cuboctahedra. The Mg(6)-Mg(3) bond length is 3.34 Å. Both Mg(6)-Mg(7) bond lengths are 3.34 Å. In the ninth Mg site, Mg(7) is bonded in a 12-coordinate geometry to one Rb(1); one Mg(2); two Mg(3,3); two equivalent Mg(4); two equivalent Mg(6); and four Mg(5,5) atoms. The Mg(7)-Mg(3) bond length is 3.42 Å. In the tenth Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Rb(1); two equivalent Ca(1); two equivalent Mg(3); two Mg(5,5); two equivalent Mg(6); and two equivalent Mg(7) atoms. Both Mg(3)-Mg(5,5) bond lengths are 3.47 Å. Both Mg(3)-Mg(6) bond lengths are 3.34 Å. Both Mg(3)-Mg(7) bond lengths are 3.42 Å. In the eleventh Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Rb(1), two equivalent Ca(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms. Both Mg(3)-Mg(5) bond lengths are 3.47 Å.