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tarnishing to copper green when exposed to the air and weathering. Chalcopyrite and pyrite are much alike.....more
SilverThe color and steak of native silver is grayish white and it remains stable in the air and water.....more
specific gravity, and lower hardness. When exposed to the air and weathering, cinnabar decomposes.....more
or air.An ore of copper, Enargite can also be a source of arsenic oxide. Enargite is found locally.....more
exposed in the wet air, often with blue-green patchesNative copper is easy to be oxidized as copper.....more
