American Heritage® Dictionary of the English Language, Fourth Edition
- n. The mineral form of black iron oxide, Fe3O4, that often occurs with magnesium, zinc, and manganese and is an important ore of iron.
Century Dictionary and Cyclopedia
- n. Magnetic oxid of iron; a black oxid of iron (Fe3O4 or FeO.Fe2O3) which is strongly attractable by a magnet. It sometimes possesses polarity, and is then called
lodestone. It occurs in isometric crystals, generally octahedrons or dodecahedrons, and also more commonly massive in beds in the older crystalline rocks; in the form of scattered grains or crystals it is a common constituent of many igneous rocks. It is an important ore of iron, and occurs in large quantities in Norway and Sweden, in the Adirondack and West Point regions of New York, and in New Jersey. Titaniferous magnetite is a variety containing some titanium.
- n. mineralogy A magnetic mineral, Fe3O4, one of the primary ores of iron. It has also been called lodestone.
GNU Webster's 1913
- 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
- n. an oxide of iron that is strongly attracted by magnets
“These mineral crystals were identified as magnetite, pyrrhotite, and greigite.”
“In 1948, Néel made another fundamental discovery with his explanation of the strong magnetism found in the ferrite materials, of which magnetite is one.”
“Like PAHs, these minerals -- mainly iron compounds called magnetite and pyrrhotite -- can come from inorganic sources.”
“Spoornet spokesman Molatwane Likhethe said these two mines produced a waste product called magnetite, containing about 55 percent iron ore.”
“It is, of course, a self-evident fact that the magnetic iron ore, which is a form of peroxide, commonly known as magnetite, or lodestone, has the power of attracting a magnet when swinging free, or of being attracted by a magnet, to account for which many plausible reasons have been advanced.”
“The copper at Hillside has a close association with the mineral magnetite, which is the cause of the magnetic anomaly.”
“Further resource drilling for the eastern extension is planned, where previous drilling undertaken has shown that the quality of the magnetite is the same as that in the western portion of the deposit.”
“Very seldom is the obsidian colorless; most often it's very dark or black due to impurities such as magnetite and hematite, both being iron oxide variations.”
“Certain minerals, such as magnetite, ilmenite, spinel, corundum, etc., are often found as primary segregations within the mass of igneous rock.”
“Previous research demonstrated that arsenic can be removed from water using activated carbon or iron minerals, such as magnetite nanocrystals.”
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