TmAg2 is Titanium Disilicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Tm is bonded in a distorted q6 geometry to ten equivalent Ag atoms. There are two shorter (3.04 Å) and eight longer (3.05 Å) Tm–Ag bond lengths. Ag is bonded in a 10-coordinate geometry to five equivalent Tm atoms.