Native silver, niccolite and maucherite. Great Bear Lake, Canada
A radiating aggregate of niccolite (pink-brown, left) has a thin maucherite (blue-grey, left) rim. Native silver (white, centre) appears to be overgrowing the arsenides. The blue-grey colour of maucherite is due to the very high reflectance of native silver.
Polished block, plane polarized light, x 160, oil