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.
和
主要赋存在方
、和方中，这3种物以植物胞腔充填形式
现，属于化学沉积成因。
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.
和主要赋存在方、和方中，这3种物以植物胞腔充填形式现，属于化学沉积成因。
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