Sphalerite, pyrite, chalcopyrite and arsenopyrite. Nigadoo River, New Brunswick, Canada

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Sphalerite (grey, top right) has chalcopyrite (yellow) inclusions and an incomplete chalcopyrite rim (bottom right). Two euhedral rhombs of arsenopyrite (white, centre, bottom right) have higher reflectance than coarse-grained pyrite (light yellow, bottom left). Fine-grained pyrite and marcasite have totally replaced pyrrhotite and appear brown-yellow due to their fine grain size. Successive 'shells' of pyrite-marcasite with different grain sizes can be seen and form a poorly defined bird's-eye texture (bottom left) growing out from coarse-grained pyrite. Gangue phases are dark grey (centre).

Polished block, plane polarized light, x 40, air

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