Crystal System: Tetragonal
Status of Occurrence: Confirmed Occurrence
Chemical Composition: Copper iron tin sulphide
Chemical Formula: Cu2FeSnS4
Method(s) of Verification: inclusions in gold grains from near Narberth identified by electron microprobe analysis.
Introduction: a rare mineral in tin-bearing hydrothermal vein deposits.
Occurrence in Wales: isolated grains of arsenopyrite, cobaltite and stannite are reported by Norton et al. (2000) as inclusions in gold grains panned from a stream north-east of Narberth, Pembrokeshire.
There are no key localities for this specimen.
- Norton, G.E., Cooper, D.C., Davies, J.R. and Cornwell, J.D., 2000. Evidence for gold mineralisation in the Lower Palaeozoic and Precambrian rocks of south-west Wales. BGS Research Report RR/00/10. DTI Minerals Programme Publication No. 5.