Placer deposit.
Pontijn (or Pontyn) river, near Asemasen town, SE cost of Borneo.
Exsolution/recrystallization two-stage process from a homogeneous Fe/Cu/Ni sulfide melt : Exsolution into MSS (monosulfide solid solution) and ISS (intermediate solid solution) and evolution of MSS into pentlandite+heazlewoodite and of ISS into chalcopyrite+bornite.
(cf. K.H. Hattori et al. , Min. Mag. , April 2004, V68, N°2, pp. 353-368).
Mineral List:15 entries listed. 12 valid minerals. 1 type locality (valid mineral).
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database!
