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 F 2 converged to R 1 =0.0791 and w R 2 =0.1864 for 704 observed reflections [I 3 2s(I)]. Daomanite is orthorhombic system, space group Cmc 2 1 a =3.7520(8))Å, b =15.844 (4) Å, c =5.8516(12) Å, α=β=γ=90°. V =347.86(14)Å 3 , Z =4. Daomanite chemical formula is CuPtAsS 2 . Idealized composition Me + M 2+ M 2+ S 2 =CuS·PtAsS. There is no other similar mineral in the world.