Deposit rich in orbicular graphite in Hercynian granite. Feng & Yu (2007) report the occurrence of natural carbon nanotubes (approx 8 nanometer diameter) at this locality.
Ref.:
- Youli Feng and Lijing Yu (2007): Naturally occurring carbon nanotubes from graphite ore deposit. Acta Scientiarum Naturalium Universitatis Sunyatseni 46, 210-211.