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全部拍賣 / Ethnographic / Copper nugget - Height: 9 cm - Width: 5 cm- 312 g - (1)
Copper is the chemical element with atomic number 29 and symbol Cu. It is the first element of group 11 in the periodic table, part of the d-block, and is therefore a transition element. Metallic copper is the second-best conductor of electricity after silver, followed by gold. It is also called "red gold" because of its coloring. Copper is the metal that humanity has used the longest. Copper was already known to some of the oldest civilizations for which we have evidence; the history of its use is estimated to be at least 10,000 years old. Copper nugget, from MICHIGAN'S LAKE SUPERIOR COPPER DISTRICT, Central America and the Caribbean. Weight: 312 g Measurements: 9x5x3 cm Shipped via express courier (tracking)
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