What does magnetite mean?
Magnetite is a mineral form of iron oxide, written chemically as Fe3O4, and is one of the principal ores from which iron is obtained. Its best-known feature is that some natural specimens are permanently magnetic, a property associated with the related term lodestone. Magnetite commonly occurs as black grains, crystals, or massive deposits in igneous and metamorphic rocks, and its presence can provide evidence about the geological history of an area. It also has important technological uses, including as a component of magnetic recording materials, catalysts, and magnetic nanoparticles. In everyday language, magnetite usually refers to the mineral itself, while lodestone more specifically denotes naturally magnetized magnetite. Because the mineral is an important source of iron, its deposits have been mined for centuries, and its distinctive combination of iron content and magnetism makes it both economically valuable and scientifically useful.
nounMagnetite is a black, opaque iron oxide mineral with the chemical formula Fe3O4. It can be strongly magnetic and is an important source of iron ore.
- A black, opaque iron oxide mineral with the chemical formula Fe3O4, some specimens of which are naturally magnetic; it is also an important iron ore.
"The deposit contains seams of magnetite that can be extracted for iron production."
"Magnetic particles in the sediment are predominantly magnetite."
"The mine produces magnetite concentrate for use in ironmaking."
Used when referring to multiple specimens, grains, crystals, or mineral occurrences of magnetite.
"Several magnetites were separated from the sand."
Magnetite is the naturally magnetic mineral that helped make early magnetic compasses possible.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does magnetite come from?
The word entered English through the Latin forms magnetis and magnes, which were derived from Greek magnētis, a term associated with Magnesia and magnetic stones. English usage developed in the early modern period, when magnetite and the older term lodestone were both associated with naturally magnetic materials. The related English words magnet, magnetic, magnetism, and magnetize developed through the same Latin and Greek vocabulary.
Related word forms
How magnetite is actually used
The word is primarily used in geology, mineralogy, mining, and materials science. In general writing, it is more technical than the everyday word for naturally magnetic stone, lodestone.
Easily confused with magnetite
Magnetite is the mineral Fe3O4 in general, whereas lodestone specifically refers to naturally magnetized pieces of magnetite.
Hematite is a different iron oxide, commonly recognizable by its reddish or steel-gray streaks, and is not as strongly magnetic as magnetite.