那些有棱角的，黑色的磁铁矿一般都是黑色的，这种矿石是地球上最为常见的磁性矿石。
The angular, black magnetite—the most common naturally occurring magnetic material on earth—is always black, however, and is frequently found near garnet.
这种矿石有轻微的磁性。
通过化验就可以确定矿石性质，基本的化验有全铁品位、磁性铁含量。
Through tests can determine the ore properties, basic tests have full iron grade, magnetic iron content.
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