Scheelite, arsenopyrite and chalcopyrite. Portugal

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Coarse-grained scheelite (light grey, left) encloses trace amounts of chalcopyrite (yellow, bottom left). Subhedral arsenopyrite (white, bottom right) is fractured along its (101) cleavage and is altered to scorodite (light grey) which is difficult to distinguish at this magnification. Dark grey area is quartz (top right). Banded grey (centre right) areas are secondary arsenates.

Polished block, plane polarized light, x 80, air

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