9 results for: Magnetite

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

mag·net·ite

Audio Help [mag-ni-tahyt] Pronunciation Key

–noun

a very common black iron oxide mineral, Fe₃O₄, that is strongly attracted by magnets: an important iron ore.

[Origin: 1850–55; magnet + -ite¹; cf. G Magnetit

]

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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Magnetite

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American Heritage Dictionary - Cite This Source - Share This

mag·net·ite Audio Help (māg'nĭ-tīt') Pronunciation Key
n. The mineral form of black iron oxide, Fe₃O₄, that often occurs with magnesium, zinc, and manganese and is an important ore of iron.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

WordNet - Cite This Source - Share This

magnetite
noun
an oxide of iron that is strongly attracted by magnets

The American Heritage Science Dictionary - Cite This Source - Share This

magnetite Audio Help (māg'nĭ-tīt') Pronunciation Key
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: Fe₃O₄.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Magnetite

I"ron\ ([imac]"[u^]rn), n. [OE. iren, AS. [=i]ren, [=i]sen, [=i]sern; akin to D. ijzer, OS. [=i]sarn, OHG. [=i]sarn, [=i]san, G. eisen, Icel. [=i]sarn, j[=a]rn, Sw. & Dan. jern, and perh. to E. ice; cf. Ir. iarann, W. haiarn, Armor. houarn.]

1. (Chem.) The most common and most useful metallic element, being of almost universal occurrence, usually in the form of an oxide (as hematite, magnetite, etc.), or a hydrous oxide (as limonite, turgite, etc.). It is reduced on an enormous scale in three principal forms; viz., cast iron, steel, and wrought iron. Iron usually appears dark brown, from oxidation or impurity, but when pure, or on a fresh surface, is a gray or white metal. It is easily oxidized (rusted) by moisture, and is attacked by many corrosive agents. Symbol Fe (Latin Ferrum). Atomic weight 55.9. Specific gravity, pure iron, 7.86; cast iron, 7.1. In magnetic properties, it is superior to all other substances.

Note: The value of iron is largely due to the facility with which it can be worked. Thus, when heated it is malleable and ductile, and can be easily welded and forged at a high temperature. As cast iron, it is easily fusible; as steel, is very tough, and (when tempered) very hard and elastic. Chemically, iron is grouped with cobalt and nickel. Steel is a variety of iron containing more carbon than wrought iron, but less that cast iron. It is made either from wrought iron, by roasting in a packing of carbon (cementation) or from cast iron, by burning off the impurities in a Bessemer converter (then called Bessemer steel), or directly from the iron ore (as in the Siemens rotatory and generating furnace).

2. An instrument or utensil made of iron; -- chiefly in composition; as, a flatiron, a smoothing iron, etc.

My young soldier, put up your iron. --Shak.

3. pl. Fetters; chains; handcuffs; manacles.

Four of the sufferers were left to rot in irons. --Macaulay.

4. Strength; power; firmness; inflexibility; as, to rule with a rod of iron.

Bar iron. See Wrought iron (below).

Bog iron, bog ore; limonite. See Bog ore, under Bog.

Cast iron (Metal.), an impure variety of iron, containing from three to six percent of carbon, part of which is united with a part of the iron, as a carbide, and the rest is uncombined, as graphite. It there is little free carbon, the product is white iron; if much of the carbon has separated as graphite, it is called gray iron. See also Cast iron, in the Vocabulary.

Fire irons. See under Fire, n.

Gray irons. See under Fire, n.

Gray iron. See Cast iron (above).

It irons (Naut.), said of a sailing vessel, when, in tacking, she comes up head to the wind and will not fill away on either tack.

Magnetic iron. See Magnetite.

Malleable iron (Metal.), iron sufficiently pure or soft to be capable of extension under the hammer; also, specif., a kind of iron produced by removing a portion of the carbon or other impurities from cast iron, rendering it less brittle, and to some extent malleable.

Meteoric iron (Chem.), iron forming a large, and often the chief, ingredient of meteorites. It invariably contains a small amount of nickel and cobalt. Cf. Meteorite.

Pig iron, the form in which cast iron is made at the blast furnace, being run into molds, called pigs.

Reduced iron. See under Reduced.

Specular iron. See Hematite.

Too many irons in the fire, too many objects requiring the attention at once.

White iron. See Cast iron (above).

Wrought iron (Metal.), the purest form of iron commonly known in the arts, containing only about half of one per cent of carbon. It is made either directly from the ore, as in the Catalan forge or bloomery, or by purifying (puddling) cast iron in a reverberatory furnace or refinery. It is tough, malleable, and ductile. When formed into bars, it is called bar iron.

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Magnetite

Load"stone`\, Lodestone \Lode"stone\, n. [Load, lode + stone.] (Min.) A piece of magnetic iron ore possessing polarity like a magnetic needle. See Magnetite.

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Magnetite

Mag*net"ic\, Magnetical \Mag*net"ic*al\, a. [L. magneticus: cf. F. magn['e]tique.]

1. Pertaining to the magnet; possessing the properties of the magnet, or corresponding properties; as, a magnetic bar of iron; a magnetic needle.

2. Of or pertaining to, or characterized by, the earth's magnetism; as, the magnetic north; the magnetic meridian.

3. Capable of becoming a magnet; susceptible to magnetism; as, the magnetic metals.

4. Endowed with extraordinary personal power to excite the feelings and to win the affections; attractive; inducing attachment.

She that had all magnetic force alone. --Donne.

5. Having, susceptible to, or induced by, animal magnetism, so called; as, a magnetic sleep. See Magnetism.

Magnetic amplitude, attraction, dip, induction, etc. See under Amplitude, Attraction, etc.

Magnetic battery, a combination of bar or horseshoe magnets with the like poles adjacent, so as to act together with great power.

Magnetic compensator, a contrivance connected with a ship's compass for compensating or neutralizing the effect of the iron of the ship upon the needle.

Magnetic curves, curves indicating lines of magnetic force, as in the arrangement of iron filings between the poles of a powerful magnet.

Magnetic elements. (a) (Chem. Physics) Those elements, as iron, nickel, cobalt, chromium, manganese, etc., which are capable or becoming magnetic. (b) (Physics) In respect to terrestrial magnetism, the declination, inclination, and intensity. (c) See under Element.

Magnetic equator, the line around the equatorial parts of the earth at which there is no dip, the dipping needle being horizontal.

Magnetic field, or Field of magnetic force, any space through which magnet exerts its influence.

Magnetic fluid, the hypothetical fluid whose existence was formerly assumed in the explanations of the phenomena of magnetism.

Magnetic iron, or Magnetic iron ore. (Min.) Same as Magnetite.

Magnetic needle, a slender bar of steel, magnetized and suspended at its center on a sharp-pointed pivot, or by a delicate fiber, so that it may take freely the direction of the magnetic meridian. It constitutes the essential part of a compass, such as the mariner's and the surveyor's.

Magnetic poles, the two points in the opposite polar regions of the earth at which the direction of the dipping needle is vertical.

Magnetic pyrites. See Pyrrhotite.

Magnetic storm (Terrestrial Physics), a disturbance of the earth's magnetic force characterized by great and sudden changes.

Magnetic telegraph, a telegraph acting by means of a magnet. See Telegraph.

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

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.

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