Ca2GaSi crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to three equivalent Ga(1) and four equivalent Si(1) atoms. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to four equivalent Ga(1) and three equivalent Si(1) atoms. Ga(1) is bonded in a 9-coordinate geometry to three equivalent Ca(1), four equivalent Ca(2), and two equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to three equivalent Ca(2), four equivalent Ca(1), and two equivalent Ga(1) atoms.
Ca2GaSi crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to three equivalent Ga(1) and four equivalent Si(1) atoms. There are two shorter (3.18 Å) and one longer (3.24 Å) Ca(1)-Ga(1) bond length. All Ca(1)-Si(1) bond lengths are 3.12 Å. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to four equivalent Ga(1) and three equivalent Si(1) atoms. All Ca(2)-Ga(1) bond lengths are 3.13 Å. There is one shorter (3.20 Å) and two longer (3.21 Å) Ca(2)-Si(1) bond lengths. Ga(1) is bonded in a 9-coordinate geometry to three equivalent Ca(1), four equivalent Ca(2), and two equivalent Si(1) atoms. Both Ga(1)-Si(1) bond lengths are 2.53 Å. Si(1) is bonded in a 9-coordinate geometry to three equivalent Ca(2), four equivalent Ca(1), and two equivalent Ga(1) atoms.