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A black mineral that is an ore of niobium and '.
一种黑色矿物，是铌、钽矿石。
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Ore prospect should be directed to PGE deposits both related to Emeishan basalt and black shale sequence.
要同时重视找寻与峨嵋山玄武岩有关和与黑色岩系有关的两类铂族矿床。
A black mineral is an ore of niobium and tantalum.
一种黑色矿物是铌、钽矿石。
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