Sphalerite, chalcopyrite and gersdorffite. Nenthead, North Pennines, Britain




Click here



250µm


Sphalerite (light grey, top) is inclusion-free and is intergrown with coarse-grained quartz (dark grey) showing faint internal reflections (centre left). Sphalerite (centre) is intergrown with chalcopyrite (yellow, centre right) and euhedral gersdorffite (white, high reflectance, centre left). Black areas are polishing pits.


Polished block, plane polarized light, x 80, air



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