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weathering, whose strength is greater to marcasite than to pyrite. Hence, there is by far less.....more
be identified according to the different colors, silver and light brass yellow. After weathering.....more
tarnishing to copper green when exposed to the air and weathering. Chalcopyrite and pyrite are much alike.....more
occurs in massive or irregular form. Pure bornite has the color of reddish bronze; after weathering.....more
specific gravity, and lower hardness. When exposed to the air and weathering, cinnabar decomposes.....more
, purple or brown. Weathered cordierites may carry shades of green, and if the weathering continues.....more
gold mining areas. Gold deposit or minerals after weathering is likely to be disintegrated into sand.....more
