The Crystal Structure of a Mineral with the Composition Pd(Bi,Sb)

A mineral with the composition Pd(Bi 0.53 Sb 0.47 ), intermediate between sobolevskite, ideally PdBi, and sudburyite, PdSb, from the Chineiskii Deposit (Transbaikal region, Russia), was studied by the SEM and XRD methods. Its crystal structure was solved and refined ( R = 3.02%) based on single crystal X-ray diffraction data. The structure is orthorhombic, and the space group is Cmcm . The unit-cell parameters are a = 4.1465(4) Å, b = 7.1782(6) Å, c = 5.6843(4) Å, V = 169.19(2) Å 3 , Z = 2. The series of the structures β-PdBi–Pd(Bi 0.53 Sb 0.47 )–PdSb and sobolevskite–sudburyite are discussed.