Molybdenite. Henderson Mine, Colorado, USA
250µm
A molybdenite veinlet cross-cuts quartz (dark grey, internal reflections, bottom). Individual molybdenite laths show their basal cleavage along (0001) and bireflectance and reflection pleochroism (light grey when east-west and dark grey-brown when north-south).
Polished block, plane polarized light, x 80, air
