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magnetite
[ mag-ni-tahyt ]
noun
- a very common black iron oxide mineral, Fe 3 O 4 , that is strongly attracted by magnets: an important iron ore.
magnetite
/ ˈmæɡnɪˌtaɪt; ˌmæɡnɪˈtɪtɪk /
noun
- a black magnetic mineral, found in igneous and metamorphic rocks and as a separate deposit. It is a source of iron. Composition: iron oxide. Formula: Fe 3 O 4 . Crystal structure: cubic
magnetite
/ măg′nĭ-tīt′ /
- A brown to black mineral that is strongly magnetic. It crystallizes in the cubic system and commonly occurs as small octahedrons. Magnetite occurs in many different types of rock and is an important source of iron. Chemical formula: Fe 3 O 4 .
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Derived Forms
- magnetitic, adjective
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Word History and Origins
Origin of magnetite1
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Example Sentences
In the more basic phases anhedrons of augite and of olivine appear, and magnetite grains are usually present.
From Project Gutenberg
Magnetite or magnetic iron ore, specular iron, and limonite are also oxides of iron.
From Project Gutenberg
Serpentine often contains it, when it is apt to resemble a fine-grained magnetite.
From Project Gutenberg
It chiefly occurs as oxide, as in magnetite, hæmatite, and in the brown iron ores and ochres.
From Project Gutenberg
Deposits of iron ore accumulated in the several ways referred to above may be metamorphosed and changed to hematite and magnetite.
From Project Gutenberg
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