Lanthanum monosulfide is a binary inorganic chemical compound of lanthanum metal and sulfur with the chemical formula LaS.[1][2]
The effect of sulfur vapor on metallic lanthanum:
Also, reduction of La2S3 with metallic La.[3]
Lanthanum monosulfide forms golden crystals[4] of the cubic system, space group Fm3m, cell parameters a = 0.586 nm, Z = 4, structurally isomorphous with NaCl.[5]