1. a hard gary-black mineral consisting of corundum and either hematite or magnetite; used as an abrasive (especially as a coating on paper). 
   一种坚硬的灰黑色矿物，由刚玉和赤铁矿或磁铁矿构成，用作研磨剂（尤其用在砂纸外表）。
2. A piece of magnetite that has magnetic properties and attracts iron or steel. 
   天然磁石有磁性的磁铁矿，能吸引铁或钢
3. There is some evidence that our own brains may contain grains of magnetite. 
   有些证据表明在我们自己的大脑中也可能包含磁铁矿的微粒。
4. Other organisms have small areas in which the magnetic mineral known as magnetite is concentrated. 
   其他一些生物有一个被称作磁铁矿的磁性矿物集中的小区域。
5. a variety of chert containing magnetite and hematite; mined as a low-grade iron ore. 
   一种含磁铁矿和赤铁矿的燧石，作为一种低等的铁矿石被开采。

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• 1. 磁性铁黑
  leading black 超前黑色...magnetite black 磁性铁黑...manganese black 锰黑, 软锰矿
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