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Introduction
| The color and streak is copper red, tarnishing brown to black when exposed in the wet air, often with blue-green patchesNative copper is easy to be oxidized as copper oxide or CO3 such as the association of cuprite, malachite, azurite. Native copper is available only in small quantity, and the cooper used in our daily life is refined from sulfides. The electric conductivity is next to that of silver, but due to lower price and availability, in the Copper Age, it had been widely used in bells, utensils, and tools . In the modern society, copper has been applied to electronics, coin making, and ornaments. |
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