Sc3InP4 is Lavarevi\'{c}ite-like structured and crystallizes in the trigonal R3m space group. There are three inequivalent Sc sites. In the first Sc site, Sc(1) is bonded to one P(1) and three equivalent P(4) atoms to form ScP4 tetrahedra that share corners with three equivalent Sc(2)P4 tetrahedra, corners with three equivalent In(1)P4 tetrahedra, and corners with six equivalent Sc(1)P4 tetrahedra. In the second Sc site, Sc(2) is bonded to one P(2) and three equivalent P(1) atoms to form corner-sharing ScP4 tetrahedra. In the third Sc site, Sc(3) is bonded to one P(3) and three equivalent P(2) atoms to form ScP4 tetrahedra that share corners with three equivalent Sc(2)P4 tetrahedra, corners with three equivalent In(1)P4 tetrahedra, and corners with six equivalent Sc(3)P4 tetrahedra. In(1) is bonded to one P(4) and three equivalent P(3) atoms to form InP4 tetrahedra that share corners with three equivalent Sc(1)P4 tetrahedra, corners with three equivalent Sc(3)P4 tetrahedra, and corners with six equivalent In(1)P4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one Sc(1) and three equivalent Sc(2) atoms to form PSc4 tetrahedra that share corners with three equivalent P(4)Sc3In tetrahedra, corners with three equivalent P(2)Sc4 tetrahedra, and corners with six equivalent P(1)Sc4 tetrahedra. In the second P site, P(2) is bonded to one Sc(2) and three equivalent Sc(3) atoms to form PSc4 tetrahedra that share corners with three equivalent P(1)Sc4 tetrahedra, corners with three equivalent P(3)ScIn3 tetrahedra, and corners with six equivalent P(2)Sc4 tetrahedra. In the third P site, P(3) is bonded to one Sc(3) and three equivalent In(1) atoms to form PScIn3 tetrahedra that share corners with three equivalent P(4)Sc3In tetrahedra, corners with three equivalent P(2)Sc4 tetrahedra, and corners with six equivalent P(3)ScIn3 tetrahedra. In the fourth P site, P(4) is bonded to three equivalent Sc(1) and one In(1) atom to form PSc3In tetrahedra that share corners with three equivalent P(1)Sc4 tetrahedra, corners with three equivalent P(3)ScIn3 tetrahedra, and corners with six equivalent P(4)Sc3In tetrahedra.
Sc3InP4 is Lavarevi\'{c}ite-like structured and crystallizes in the trigonal R3m space group. There are three inequivalent Sc sites. In the first Sc site, Sc(1) is bonded to one P(1) and three equivalent P(4) atoms to form ScP4 tetrahedra that share corners with three equivalent Sc(2)P4 tetrahedra, corners with three equivalent In(1)P4 tetrahedra, and corners with six equivalent Sc(1)P4 tetrahedra. The Sc(1)-P(1) bond length is 2.58 Å. All Sc(1)-P(4) bond lengths are 2.56 Å. In the second Sc site, Sc(2) is bonded to one P(2) and three equivalent P(1) atoms to form corner-sharing ScP4 tetrahedra. The Sc(2)-P(2) bond length is 2.58 Å. All Sc(2)-P(1) bond lengths are 2.57 Å. In the third Sc site, Sc(3) is bonded to one P(3) and three equivalent P(2) atoms to form ScP4 tetrahedra that share corners with three equivalent Sc(2)P4 tetrahedra, corners with three equivalent In(1)P4 tetrahedra, and corners with six equivalent Sc(3)P4 tetrahedra. The Sc(3)-P(3) bond length is 2.57 Å. All Sc(3)-P(2) bond lengths are 2.56 Å. In(1) is bonded to one P(4) and three equivalent P(3) atoms to form InP4 tetrahedra that share corners with three equivalent Sc(1)P4 tetrahedra, corners with three equivalent Sc(3)P4 tetrahedra, and corners with six equivalent In(1)P4 tetrahedra. The In(1)-P(4) bond length is 2.58 Å. All In(1)-P(3) bond lengths are 2.58 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one Sc(1) and three equivalent Sc(2) atoms to form PSc4 tetrahedra that share corners with three equivalent P(4)Sc3In tetrahedra, corners with three equivalent P(2)Sc4 tetrahedra, and corners with six equivalent P(1)Sc4 tetrahedra. In the second P site, P(2) is bonded to one Sc(2) and three equivalent Sc(3) atoms to form PSc4 tetrahedra that share corners with three equivalent P(1)Sc4 tetrahedra, corners with three equivalent P(3)ScIn3 tetrahedra, and corners with six equivalent P(2)Sc4 tetrahedra. In the third P site, P(3) is bonded to one Sc(3) and three equivalent In(1) atoms to form PScIn3 tetrahedra that share corners with three equivalent P(4)Sc3In tetrahedra, corners with three equivalent P(2)Sc4 tetrahedra, and corners with six equivalent P(3)ScIn3 tetrahedra. In the fourth P site, P(4) is bonded to three equivalent Sc(1) and one In(1) atom to form PSc3In tetrahedra that share corners with three equivalent P(1)Sc4 tetrahedra, corners with three equivalent P(3)ScIn3 tetrahedra, and corners with six equivalent P(4)Sc3In tetrahedra.