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SrCaZn2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two SrCaZn2 ribbons oriented in the (0, 1, 0) direction. Sr is bonded in a linear geometry to two equivalent Zn atoms. Both Sr–Zn bond lengths are 3.50 Å. Ca is bonded in a linear geometry to two equivalent Zn atoms. Both Ca–Zn bond lengths are 3.37 Å. Zn is bonded in a linear geometry to one Sr and one Ca atom.
SrCaZn2 crystallizes in the orthorhombic Pmc2_1 space group. The structure is three-dimensional. Sr is bonded in a 7-coordinate geometry to seven Zn atoms. There are a spread of Sr–Zn bond distances ranging from 3.32–3.37 Å. Ca is bonded in a 7-coordinate geometry to seven Zn atoms. There are a spread of Ca–Zn bond distances ranging from 3.21–3.54 Å. There are two inequivalent Zn sites. In the first Zn site, Zn is bonded in a 9-coordinate geometry to four equivalent Sr, three equivalent Ca, and two equivalent Zn atoms. Both Zn–Zn bond lengths are 2.63 Å. In the second Zn site, Zn is bonded in a 9-coordinate geometry to three equivalent Sr, four equivalent Ca, and two equivalent Zn atoms.