词Lead and selenium mainly exist in galena, clausthalite, and selenio-galena which occur as cell-filling of coal-forming plants and are of chemical-sedimentary origin.
铅和
主要赋存在方铅矿、铅矿和方铅矿中，这3种矿物以植物胞腔充填形式出
，
化学沉积成因。
Lead and selenium mainly exist in galena, clausthalite, and selenio-galena which occur as cell-filling of coal-forming plants and are of chemical-sedimentary origin.
铅和主要赋存在方铅矿、铅矿和方铅矿中，这3种矿物以植物胞腔充填形式出，化学沉积成因。
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