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and streak of graphite is black, the same as diamond, a carbon mineral. However, due to different.....more
. But if there is sulfur, silver easily response to the chemical reaction and forms gray or black Ag2S.....more
、貨幣、裝飾品等方面。礦物自然元素自然銅Native CopperThe color and streak is copper red, tarnishing brown to black when.....more
