n.磁铁矿；四氧化三铁锈层

Magnetite is a mineral and one of the main iron ores, with the chemical formula Fe3O4.
磁铁矿是一种矿物，也是主要的铁矿石之一，其化学式为Fe3O4。
The black sand on some beaches is actually magnetite, which is attracted to magnets.
一些海滩上的黑沙实际上是磁铁矿，它会被磁铁吸引。
Magnetite has been used since ancient times to make compasses due to its magnetic properties.
自古以来，人们就利用磁铁矿的磁性来制作指南针。
In the process of steel production, magnetite is converted into metallic iron through reduction.
在钢铁生产过程中，磁铁矿通过还原反应转化为金属铁。
Magnetite particles in the brain of certain animals are thought to aid in navigation.
某些动物大脑中的磁铁矿颗粒被认为有助于导航。
Geologists study magnetite deposits to understand past Earth's magnetic field reversals.
地质学家研究磁铁矿沉积物以了解地球过去的磁场翻转。
The magnetic properties of magnetite make it useful in data storage devices like hard drives.
磁铁矿的磁性使其在硬盘驱动器等数据存储设备中非常有用。
Magnetite can form as a byproduct of volcanic activity or through the alteration of other iron-rich minerals.
磁铁矿可以作为火山活动的副产品形成，或通过其他富含铁的矿物的转变产生。
In alternative medicine, magnetite jewelry is believed by some to have therapeutic properties.
在替代医学中，有些人认为佩戴磁铁矿首饰具有治疗效果。
The study of magnetite in archaeological artifacts helps date and understand ancient technologies.
在考古文物中研究磁铁矿有助于确定年代并理解古代技术。