Crystal System: Tetragonal
Status of Occurrence: Confirmed Occurrence
Distribution: Rare
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.

Key Localities:

There are no key localities for this specimen.


  1. 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.