Native silver, niccolite and maucherite. Great Bear Lake, Canada

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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

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