Look up: magnetite

1. 
   Magnetite
   Magnetite has the formulae Fe3O4. It has a relative hardness of 7. It is the richest and most important ore of iron. Found as an accessory mineral in most igneous rocks. Highly magnetic.
   Found on http://www.encyclo.co.uk/nol.php
   
   
2. 
   magnetite
   [n] - an oxide of iron that is strongly attracted by magnets
   Found on http://www.webdictionary.co.uk/definitio
   
   
3. 
   Magnetite
   Mag'net·ite noun (Min.) An oxide of iron (Fe ₃ O ₄ ) 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 .
   Found on http://www.encyclo.co.uk/webster/M/6
   
   
4. 
   magnetite
   <chemical> An oxide of iron (Fe3O4) occurring in isometric crystals, also massive, of a black colour and metallic luster. It is readily attracted by a magnet and sometimes possesses polarity, being then called loadstone. It is an important iron ore. ... Synonym: magnetic iron. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
5. 
   magnetite
   magnetic iron-ore noun an oxide of iron that is strongly attracted by magnets
   Found on http://wordnet.princeton.edu/perl/webwn?
   
   
6. 
   Magnetite
   `Magnetite` is a ferrimagnetic mineral with chemical formula `Fe3O4`, one of several iron oxides and a member of the spinel group. The chemical IUPAC name is `iron(II,III) oxide` and the common chemical name `ferrous-ferric oxide`. The formula for magnetite may also be written as FeO.Fe2O3, which is one part wüstite (FeO) and one part hematite (Fe2O3). This refers to the different oxidation states of the iron in one structure, not a solid solutio...
   Found on http://en.wikipedia.org/wiki/Magnetite
   
   
7. 
   Magnetite
   • (n.) 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.
   Found on http://thinkexist.com/dictionary/meaning
   
   
8. 
   magnetite
   iron oxide mineral (FeFe2O4, or Fe3O4) that is the chief member of one of the series of the spinel (q.v.) group. Minerals in this series form black ... [15 related articles]
   Found on http://www.britannica.com/eb/a-z/m/11
   
   
9. 
   Magnetite
   An aggregate used in heavy weight concrete, consisting primarily of ferrous metaferrite (Fe304). A black magnetic iron ore with a specific gravity of approximately 5.2 and a Mohs hardness of about 6.
   Found on http://www.moxie-intl.com/glossary.htm
   
   
10. 
    Magnetite
    Iron oxide ( Fe₃O₄). A protective coating the forms on iron pipe to prevent further rapid corrosion. Usually black or maroon in color. Can be very destructive to mechanical seal components until the oxide stabalizes. We often find these iron pipes in new hot water systems
    Found on http://www.mcnallyinstitute.com/Charts/G
    
    
11. 
    magnetite
    magnetite (măg'nutīt) , lustrous black, magnetic mineral, Fe3O4. It occurs in crystals of the cubic system, in masses, and as a loose sand. It is one of the important ores of iron (magnetic iron ore) and is a common constituent of igneous and metamorphic rocks. It is found in Norway,...
    Found on http://www.infoplease.com/ce6/sci/A08311