Nuclear gamma resonance of Sn119 and Fe57 in franckeite and cylindrite.

Abstract

The NGR data indicate that the coordination symmetry and valence states of tin ions are the same in franckeite and cylindrite, but that cylindrite contains more Sn2+. Also Fe is essential to both minerals. Apparently one structural layer in both minerals contains Fe ions combined with disulphide groups S-S2-, and the other layer is composed of FeS6 octahedra. -K.A.R.