About the rocks that are found in the arizona mountains?

Question

I recently went hiking around the mountians in tuscon, arizona. On the mountain there were many rocks that had this silvery shiney stuff on them. It looked like a mirror or like aluminum foil and it flaked off the rocks easily. It was all over the mountains. Does anybody know what that is called?

Answer 1

mercury, probably leftovers from miners that used mercury to extract gold from ores.

Answer 2

Probably mica.

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