Comprehension Check 3.7
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a reddish orange metal that is a good conductor of electricity
copper
the gemstone that is the hardest of all known minerals
diamond
the most commonly used metal
iron (or steel)
any rock containing a metal together with impurities
ore
metals such as gold, silver, and platinum that are known for their durability, rarity, and beauty
precious metals
The rarest, most durable and beautiful gems
precious stones
