MnCd2S3 is Enargite-like structured and crystallizes in the monoclinic Cm space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one S(3), one S(5), and two equivalent S(2) atoms to form MnS4 tetrahedra that share  a cornercorner with one Cd(1)S4 tetrahedra, corners with two equivalent Mn(1)S4 tetrahedra, corners with two equivalent Mn(2)S4 tetrahedra, corners with two equivalent Cd(2)S4 tetrahedra, corners with two equivalent Cd(4)S4 tetrahedra, and corners with three equivalent Cd(3)S4 tetrahedra. In the second Mn site, Mn(2) is bonded to one S(1), one S(6), and two equivalent S(3) atoms to form MnS4 tetrahedra that share  a cornercorner with one Cd(2)S4 tetrahedra, corners with two equivalent Mn(1)S4 tetrahedra, corners with two equivalent Mn(2)S4 tetrahedra, corners with two equivalent Cd(3)S4 tetrahedra, corners with two equivalent Cd(4)S4 tetrahedra, and corners with three equivalent Cd(1)S4 tetrahedra. There are four inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to one S(1), one S(5), and two equivalent S(6) atoms to form CdS4 tetrahedra that share  a cornercorner with one Mn(1)S4 tetrahedra, corners with two equivalent Cd(1)S4 tetrahedra, corners with two equivalent Cd(2)S4 tetrahedra, corners with two equivalent Cd(3)S4 tetrahedra, corners with two equivalent Cd(4)S4 tetrahedra, and corners with three equivalent Mn(2)S4 tetrahedra. In the second Cd site, Cd(2) is bonded to one S(2), one S(6), and two equivalent S(4) atoms to form CdS4 tetrahedra that share  a cornercorner with one Mn(2)S4 tetrahedra, corners with two equivalent Mn(1)S4 tetrahedra, corners with two equivalent Cd(1)S4 tetrahedra, corners with two equivalent Cd(2)S4 tetrahedra, corners with two equivalent Cd(3)S4 tetrahedra, and corners with three equivalent Cd(4)S4 tetrahedra. In the third Cd site, Cd(3) is bonded to one S(3), one S(4), and two equivalent S(5) atoms to form CdS4 tetrahedra that share  a cornercorner with one Cd(4)S4 tetrahedra, corners with two equivalent Mn(2)S4 tetrahedra, corners with two equivalent Cd(1)S4 tetrahedra, corners with two equivalent Cd(2)S4 tetrahedra, corners with two equivalent Cd(3)S4 tetrahedra, and corners with three equivalent Mn(1)S4 tetrahedra. In the fourth Cd site, Cd(4) is bonded to one S(2), one S(4), and two equivalent S(1) atoms to form CdS4 tetrahedra that share  a cornercorner with one Cd(3)S4 tetrahedra, corners with two equivalent Mn(1)S4 tetrahedra, corners with two equivalent Mn(2)S4 tetrahedra, corners with two equivalent Cd(1)S4 tetrahedra, corners with two equivalent Cd(4)S4 tetrahedra, and corners with three equivalent Cd(2)S4 tetrahedra. There are six inequivalent S sites. In the first S site, S(1) is bonded to one Mn(2), one Cd(1), and two equivalent Cd(4) atoms to form SMnCd3 tetrahedra that share  a cornercorner with one S(5)MnCd3 tetrahedra, corners with two equivalent S(4)Cd4 tetrahedra, corners with two equivalent S(2)Mn2Cd2 tetrahedra, corners with two equivalent S(3)Mn3Cd tetrahedra, corners with two equivalent S(1)MnCd3 tetrahedra, and corners with three equivalent S(6)MnCd3 tetrahedra. In the second S site, S(2) is bonded to two equivalent Mn(1), one Cd(2), and one Cd(4) atom to form SMn2Cd2 tetrahedra that share  a cornercorner with one S(6)MnCd3 tetrahedra, corners with two equivalent S(2)Mn2Cd2 tetrahedra, corners with two equivalent S(3)Mn3Cd tetrahedra, corners with two equivalent S(1)MnCd3 tetrahedra, corners with two equivalent S(5)MnCd3 tetrahedra, and corners with three equivalent S(4)Cd4 tetrahedra. In the third S site, S(3) is bonded to one Mn(1), two equivalent Mn(2), and one Cd(3) atom to form SMn3Cd tetrahedra that share  a cornercorner with one S(4)Cd4 tetrahedra, corners with two equivalent S(2)Mn2Cd2 tetrahedra, corners with two equivalent S(3)Mn3Cd tetrahedra, corners with two equivalent S(1)MnCd3 tetrahedra, corners with two equivalent S(6)MnCd3 tetrahedra, and corners with three equivalent S(5)MnCd3 tetrahedra. In the fourth S site, S(4) is bonded to one Cd(3), one Cd(4), and two equivalent Cd(2) atoms to form SCd4 tetrahedra that share  a cornercorner with one S(3)Mn3Cd tetrahedra, corners with two equivalent S(4)Cd4 tetrahedra, corners with two equivalent S(1)MnCd3 tetrahedra, corners with two equivalent S(5)MnCd3 tetrahedra, corners with two equivalent S(6)MnCd3 tetrahedra, and corners with three equivalent S(2)Mn2Cd2 tetrahedra. In the fifth S site, S(5) is bonded to one Mn(1), one Cd(1), and two equivalent Cd(3) atoms to form SMnCd3 tetrahedra that share  a cornercorner with one S(1)MnCd3 tetrahedra, corners with two equivalent S(4)Cd4 tetrahedra, corners with two equivalent S(2)Mn2Cd2 tetrahedra, corners with two equivalent S(5)MnCd3 tetrahedra, corners with two equivalent S(6)MnCd3 tetrahedra, and corners with three equivalent S(3)Mn3Cd tetrahedra. In the sixth S site, S(6) is bonded to one Mn(2), one Cd(2), and two equivalent Cd(1) atoms to form SMnCd3 tetrahedra that share  a cornercorner with one S(2)Mn2Cd2 tetrahedra, corners with two equivalent S(4)Cd4 tetrahedra, corners with two equivalent S(3)Mn3Cd tetrahedra, corners with two equivalent S(5)MnCd3 tetrahedra, corners with two equivalent S(6)MnCd3 tetrahedra, and corners with three equivalent S(1)MnCd3 tetrahedra.
MnCd2S3 is Enargite-like structured and crystallizes in the monoclinic Cm space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one S(3), one S(5), and two equivalent S(2) atoms to form MnS4 tetrahedra that share  a cornercorner with one Cd(1)S4 tetrahedra, corners with two equivalent Mn(1)S4 tetrahedra, corners with two equivalent Mn(2)S4 tetrahedra, corners with two equivalent Cd(2)S4 tetrahedra, corners with two equivalent Cd(4)S4 tetrahedra, and corners with three equivalent Cd(3)S4 tetrahedra. The Mn(1)-S(3) bond length is 2.47 Å. The Mn(1)-S(5) bond length is 2.42 Å. Both Mn(1)-S(2) bond lengths are 2.46 Å. In the second Mn site, Mn(2) is bonded to one S(1), one S(6), and two equivalent S(3) atoms to form MnS4 tetrahedra that share  a cornercorner with one Cd(2)S4 tetrahedra, corners with two equivalent Mn(1)S4 tetrahedra, corners with two equivalent Mn(2)S4 tetrahedra, corners with two equivalent Cd(3)S4 tetrahedra, corners with two equivalent Cd(4)S4 tetrahedra, and corners with three equivalent Cd(1)S4 tetrahedra. The Mn(2)-S(1) bond length is 2.44 Å. The Mn(2)-S(6) bond length is 2.43 Å. Both Mn(2)-S(3) bond lengths are 2.48 Å. There are four inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to one S(1), one S(5), and two equivalent S(6) atoms to form CdS4 tetrahedra that share  a cornercorner with one Mn(1)S4 tetrahedra, corners with two equivalent Cd(1)S4 tetrahedra, corners with two equivalent Cd(2)S4 tetrahedra, corners with two equivalent Cd(3)S4 tetrahedra, corners with two equivalent Cd(4)S4 tetrahedra, and corners with three equivalent Mn(2)S4 tetrahedra. The Cd(1)-S(1) bond length is 2.56 Å. The Cd(1)-S(5) bond length is 2.56 Å. Both Cd(1)-S(6) bond lengths are 2.56 Å. In the second Cd site, Cd(2) is bonded to one S(2), one S(6), and two equivalent S(4) atoms to form CdS4 tetrahedra that share  a cornercorner with one Mn(2)S4 tetrahedra, corners with two equivalent Mn(1)S4 tetrahedra, corners with two equivalent Cd(1)S4 tetrahedra, corners with two equivalent Cd(2)S4 tetrahedra, corners with two equivalent Cd(3)S4 tetrahedra, and corners with three equivalent Cd(4)S4 tetrahedra. The Cd(2)-S(2) bond length is 2.57 Å. The Cd(2)-S(6) bond length is 2.56 Å. Both Cd(2)-S(4) bond lengths are 2.54 Å. In the third Cd site, Cd(3) is bonded to one S(3), one S(4), and two equivalent S(5) atoms to form CdS4 tetrahedra that share  a cornercorner with one Cd(4)S4 tetrahedra, corners with two equivalent Mn(2)S4 tetrahedra, corners with two equivalent Cd(1)S4 tetrahedra, corners with two equivalent Cd(2)S4 tetrahedra, corners with two equivalent Cd(3)S4 tetrahedra, and corners with three equivalent Mn(1)S4 tetrahedra. The Cd(3)-S(3) bond length is 2.58 Å. The Cd(3)-S(4) bond length is 2.55 Å. Both Cd(3)-S(5) bond lengths are 2.56 Å. In the fourth Cd site, Cd(4) is bonded to one S(2), one S(4), and two equivalent S(1) atoms to form CdS4 tetrahedra that share  a cornercorner with one Cd(3)S4 tetrahedra, corners with two equivalent Mn(1)S4 tetrahedra, corners with two equivalent Mn(2)S4 tetrahedra, corners with two equivalent Cd(1)S4 tetrahedra, corners with two equivalent Cd(4)S4 tetrahedra, and corners with three equivalent Cd(2)S4 tetrahedra. The Cd(4)-S(2) bond length is 2.58 Å. The Cd(4)-S(4) bond length is 2.55 Å. Both Cd(4)-S(1) bond lengths are 2.57 Å. There are six inequivalent S sites. In the first S site, S(1) is bonded to one Mn(2), one Cd(1), and two equivalent Cd(4) atoms to form SMnCd3 tetrahedra that share  a cornercorner with one S(5)MnCd3 tetrahedra, corners with two equivalent S(4)Cd4 tetrahedra, corners with two equivalent S(2)Mn2Cd2 tetrahedra, corners with two equivalent S(3)Mn3Cd tetrahedra, corners with two equivalent S(1)MnCd3 tetrahedra, and corners with three equivalent S(6)MnCd3 tetrahedra. In the second S site, S(2) is bonded to two equivalent Mn(1), one Cd(2), and one Cd(4) atom to form SMn2Cd2 tetrahedra that share  a cornercorner with one S(6)MnCd3 tetrahedra, corners with two equivalent S(2)Mn2Cd2 tetrahedra, corners with two equivalent S(3)Mn3Cd tetrahedra, corners with two equivalent S(1)MnCd3 tetrahedra, corners with two equivalent S(5)MnCd3 tetrahedra, and corners with three equivalent S(4)Cd4 tetrahedra. In the third S site, S(3) is bonded to one Mn(1), two equivalent Mn(2), and one Cd(3) atom to form SMn3Cd tetrahedra that share  a cornercorner with one S(4)Cd4 tetrahedra, corners with two equivalent S(2)Mn2Cd2 tetrahedra, corners with two equivalent S(3)Mn3Cd tetrahedra, corners with two equivalent S(1)MnCd3 tetrahedra, corners with two equivalent S(6)MnCd3 tetrahedra, and corners with three equivalent S(5)MnCd3 tetrahedra. In the fourth S site, S(4) is bonded to one Cd(3), one Cd(4), and two equivalent Cd(2) atoms to form SCd4 tetrahedra that share  a cornercorner with one S(3)Mn3Cd tetrahedra, corners with two equivalent S(4)Cd4 tetrahedra, corners with two equivalent S(1)MnCd3 tetrahedra, corners with two equivalent S(5)MnCd3 tetrahedra, corners with two equivalent S(6)MnCd3 tetrahedra, and corners with three equivalent S(2)Mn2Cd2 tetrahedra. In the fifth S site, S(5) is bonded to one Mn(1), one Cd(1), and two equivalent Cd(3) atoms to form SMnCd3 tetrahedra that share  a cornercorner with one S(1)MnCd3 tetrahedra, corners with two equivalent S(4)Cd4 tetrahedra, corners with two equivalent S(2)Mn2Cd2 tetrahedra, corners with two equivalent S(5)MnCd3 tetrahedra, corners with two equivalent S(6)MnCd3 tetrahedra, and corners with three equivalent S(3)Mn3Cd tetrahedra. In the sixth S site, S(6) is bonded to one Mn(2), one Cd(2), and two equivalent Cd(1) atoms to form SMnCd3 tetrahedra that share  a cornercorner with one S(2)Mn2Cd2 tetrahedra, corners with two equivalent S(4)Cd4 tetrahedra, corners with two equivalent S(3)Mn3Cd tetrahedra, corners with two equivalent S(5)MnCd3 tetrahedra, corners with two equivalent S(6)MnCd3 tetrahedra, and corners with three equivalent S(1)MnCd3 tetrahedra.