Uraninite, carbonaceous matter and chalcopyrite. Port Radium, Northwest Territories, Canada

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Uraninite (light grey, left) forms coarse botryoidal aggregates and smaller 'blasenblende' (bottom centre) and contains chalcopyrite (yellow, top centre), often along shrinkage cracks. Coarse carbonaceous matter (brown-grey, top right) shows faint bireflectance and reflection pleochroism (brown-grey to grey, right centre). The carbonate gangue (dark greys) shows cleavage, polysynthetic twinning (centre top) and bireflectance.

Polished block, plane polarized light, x 40, air

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