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  2. Copper - Wikipedia

    en.wikipedia.org/wiki/Copper

    Native copper is a polycrystal, with the largest single crystal ever described measuring 4.4 × 3.2 × 3.2 cm. [27] Copper is the 26th most abundant element in Earth's crust, representing 50 ppm compared with 75 ppm for zinc, and 14 ppm for lead. [28]