The mineral galena is composed of lead sulfide. But when lead is found alone and not combined with another element, it is referred to as native lead.
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释义
方铅矿这种矿物就是由铅硫化物组成的。但如果铅以单元素形式构成物质而不与其它元素结合,便可称此种矿物为自然铅。
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