unidentified altered material in black mineral

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Locality: Autoroute 155 roadcut, Mékinac RCM, Mauricie, Québec, Canada

This is a magnification of the brown feldspar piece with black prisms. The field of view here is about 12mm. The olive brown mineral is initmately associated with the black mineral and appears to be altered from it. Note the texture of the mineral.

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