Study on the Crystal of Daomanite

It was not possible to carry out a complete analyses of crystal, as the experiment by Ding and Shi et al. It's analysis precision R=0.25 or more big than this, which value are not satisfied for single crystal study, but we through many test and found the best: R(int)=14.5%]. The final full‐matix least‐squares refinement on F² converged to R₁=0.0791 and wR₂=0.1864 for 704 observed reflections I³ 2s(I)]. Daomanite is orthorhombic system, space group Cmc2₁ a=3.7520(8))Å, b=15.844 (4) Å, c=5.8516(12) Å, α=β=γ=90°. V=347.86(14)ų, Z=4. Daomanite chemical formula is CuPtAsS₂. Idealized composition Me⁺M²⁺M²⁺S₂=CuS·PtAsS. There is no other similar mineral in the world.