SrCaSi4 is Caswellsilverite-like structured and crystallizes in the trigonal P-3m1 space group. Sr(1) is bonded to six equivalent Si(1) atoms to form distorted edge-sharing SrSi6 octahedra. Ca(1) is bonded to six equivalent Si(2) atoms to form edge-sharing CaSi6 octahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 6-coordinate geometry to three equivalent Sr(1) and three equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to three equivalent Ca(1) and three equivalent Si(1) atoms.
SrCaSi4 is Caswellsilverite-like structured and crystallizes in the trigonal P-3m1 space group. Sr(1) is bonded to six equivalent Si(1) atoms to form distorted edge-sharing SrSi6 octahedra. All Sr(1)-Si(1) bond lengths are 3.16 Å. Ca(1) is bonded to six equivalent Si(2) atoms to form edge-sharing CaSi6 octahedra. All Ca(1)-Si(2) bond lengths are 3.05 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 6-coordinate geometry to three equivalent Sr(1) and three equivalent Si(2) atoms. All Si(1)-Si(2) bond lengths are 2.41 Å. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to three equivalent Ca(1) and three equivalent Si(1) atoms.