Pyrite, chalcopyrite, pyrrhotite, native gold. Vaal Reef, Witwatersrand, Republic of South Africa

Click here


Pyrite (light yellow) encloses small inclusions of chalcopyrite (yellow, centre right), pyrrhotite (brown, centre left) and a mixed chalcopyrite-pyrrhotite (centre top) inclusion. A small native gold grain (golden yellow, high reflectance, centre right) is also present and has a higher reflectance than chalcopyrite. Quartz is dark grey.

Polished block, plane polarized light, x 160, oil

Click here for Associations Click here for Mineralogy Click here for high-res image (~300K)