Introduction: nagyagite typically occurs in precious metal deposits, including both mesothermal and epithermal gold-lodes. It is typically accompanied by other gold and silver tellurides.

Occurrence in Wales: the presence of 'nagyagite' was noted by Gilbey (1968), who described it occurring as thin contact-rims between native gold and tellurides in a sample from Clogau Mine, Bontddu, Gwynedd. However, subsequent work with the electron microprobe on this sample, by D.H.M. Alderton, indicated that the rim-forming phase was in fact native bismuth, a re-identification published by Mason et al. (2002). Therefore, nagyagite is not a valid Welsh species.

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