Chalcopyrite, pyrite, stannite and sphalerite. Neves-Corvo, Portugal

Click here


Euhedral to subhedral pyrite crystals (light yellow, high reflectance, top right) occur within chalcopyrite (yellow). Sphalerite (light grey, top left, bottom right) has lower reflectance and less surface colour than stannite (light brown, centre). Both are intergrown with chalcopyrite and locally with each other (centre left). Dark grey areas are silicate.

Polished block, plane polarized light, x 80, air

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