Definition of magnetite in English:

magnetite

noun

  • [mass noun] A grey-black magnetic mineral which consists of an oxide of iron and is an important form of iron ore.

    • ‘The magnetite, uralite, and other minerals can be exposed by etching away the enclosing calcite with hydrochloric acid.’
    • ‘The majority of the rhyolites are porphyritic and contain phenocrysts of one or more of the following: plagioclase, clinopyroxene, magnetite, quartz and sanidine, plus accessory apatite and zircon.’
    • ‘More important, because the presence of magnetite gives the basalt measurable magnetic properties, these newly discovered magnetic variations provided another means to study the deep ocean floor.’
    • ‘This colour change occurs over only a few metres on the ground and is probably related to the reduction of hematite to magnetite.’
    • ‘The new ‘evidence’ is tiny (one-millionth of an inch in diameter) crystals of magnetite, a magnetic oxide of iron.’
    • ‘Along the contact zone the limestones were recrystallized into a cloudy white, massive calcite containing grossular, epidote, magnetite, quartz, and tremolite.’
    • ‘The sedimentary clasts also contain abundant opaque minerals, chiefly magnetite.’
    • ‘The sample is composed of K-feldspar, plagioclase and quartz with accessory apatite, magnetite, titanite, zircon and secondary epidote.’
    • ‘The replacement of the authigenic magnetite by hematite probably occurred at the same time as the specular hematite that surrounds the dolomite grains.’
    • ‘Lodestones are simply naturally occurring magnets composed of the magnetic mineral magnetite.’
    • ‘Spinels in the country rock are essentially pure magnetite.’
    • ‘In part, the hypothesis involved tiny grains of the naturally magnetic mineral magnetite, which is commonly found in basalt (a high-temperature volcanic rock that makes up oceanic crust).’
    • ‘Chemically, Strain 121's respiration process reduces ferric iron to ferrous iron and forms the mineral magnetite, the source of most of the magnetic material deposited on Earth some two billion years ago.’
    • ‘The palaeomagnetic analyses of this study have revealed that the dominant carrier of remanent magnetization of the Whin Sill dolerite is relatively pure magnetite in the pseudo-single domain size range.’
    • ‘The third potential way the hematite could have formed is by oxidation of a mineral called magnetite in basalt and lavas.’
    • ‘The dominant carrier of remanent magnetization of the doleritic rocks is relatively pure magnetite of pseudo-single domain size, and the characteristic remanent magnetizations are typically well defined and unidirectional.’
    • ‘In the left test tube, a magnet attracts magnetite, the byproduct of Strain 121's respiration of iron oxide and offers a tell-tale sign of life in the tube.’
    • ‘Microscopic analyses reveal that the oxide mineralogy of the dolerites is dominated by magnetite and ilmenite.’
    • ‘Nearby is a magnet, composed of natural magnetite, that once belonged to Lomonosov.’
    • ‘The claims centre on a mineral with a high iron content called magnetite, which is found embedded in the Martian rock in an unusual form.’
    lodestone, magnetite
    View synonyms

Origin

Mid 19th century: from magnet + -ite.

Pronunciation:

magnetite

/ˈmaɡnɪtʌɪt/