Molybdenite. Henderson Mine, Colorado, USA

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Stubby crystals of molybdenite show cleavage along (0001) (centre) and marked bireflectance (grey to grey-brown). Lath-shaped crystals are well polished but basal sections are poorly polished (centre). The gangue is quartz showing diffuse internal reflections. Black areas are polishing pits.

Polished block, plane polarized light, x 80, air

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