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The Collaborative International Dictionary

Magnetite \Mag"net*ite\, n. (Min.) An oxide of iron ( Fe3O4) occurring in isometric crystals, also massive, of a black color and metallic luster. It is readily attracted by a magnet and sometimes possesses polarity, being then called loadstone. It is an important iron ore. Called also magnetic iron.

Douglas Harper's Etymology Dictionary

magnetic iron ore, 1840, from German magnetit; see magnet + -ite (2).


n. (context mineralogy English) A magnetic mineral, iron3oxygen4, one of the primary ores of iron. It has also been called lodestone.


n. an oxide of iron that is strongly attracted by magnets [syn: magnetic iron-ore]


Magnetite is a mineral and one of the three common naturally-occurring oxides of iron. Its chemical formula is FeO, and it is a member of the spinel group. Magnetite is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself. It is the most magnetic of all the naturally-occurring minerals on Earth. Naturally-magnetized pieces of magnetite, called lodestone, will attract small pieces of iron, which is how ancient peoples first discovered the property of magnetism.

Small grains of magnetite occur in almost all igneous and metamorphic rocks. Magnetite is black or brownish-black with a metallic luster, has a Mohs hardness of 5–6 and leaves a black streak.

The chemical IUPAC name is iron(II,III) oxide and the common chemical name is ferrous-ferric oxide.

Usage examples of "magnetite".

She focused on the one goblin, on its helmet, as she held before her a black, rough-edged stone, magnetite, or lodestone, by name.

All the while, Pony rubbed her fingers about several chosen stones: graphite and magnetite, the powerful ruby and protective serpentine and malachite.

Pony quickly focused the magnetite energy, blocked out all other metallic influences except one giant gauntlet.

As she passed the open door and Elbryan, Pony put her other hand, holding the magnetite, against the outside of the metallic door and fell into that magic as well.

Pony rubbed her fingers about several chosen stones: graphite and magnetite, the powerful ruby and protective serpentine and malachite.

Plus there were large quantities of magnetite in every soot line, no matter what the area around it contained.

The magnetite is then subject to magnetic pulses, sufficient to extract monopoles form a depth of a few centimeters.

It could not be a hunk of magnetite with a high iron content: the shape was too regular.

Likely he wore other shielding items-an emerald, perhaps, to bring a defensive shield against wood as the magnetite protected him from metal.

Her gaze focused on the lodestone, the magnetite, the stone she had used against Markwart, the damning piece of evidence that would surely seal her doom should she ever go to trial.

I discovered that the exoskeleton was an organic-inorganic matrix composed of carbon compounds and silicate minerals, primarily olivine, pyroxene, and magnetite, substances commonly found in meteorites.

Biologists routinely use the presence of magnetite as a signature of those early Earthly forms.

The discovery of magnetite in human brain cells back in the late twentieth century had bolstered their claims with the kind of pseudo-science backing such people thrived on.

Given the minuscule quantities of magnetite actually involved, it was extremely unlikely that any of them could act as a human compass.

That had to wait for genetic engineering to manipulate cells, incorporating magnetite particles into a ferro-vesicle cell model.