1. 
   corundum
   The most prestigious sapphires, ranging in colour from clear cornflower to deep blue are the 'Kashmir blue' sapphires, imported to Europe from India since 1862.Corundums can be artificially produced, but under a microscope reveal curved striation and gas bubbles which do not occur in the natural sto...
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   Corundum
   Co·run'dum (ko*rŭn'dŭm) noun ; plural Corundums (- dŭmz). [ Also corindon .] [ From Hind. kurand corundum stone.] (Min.) The earth alumina, as found native in a crystalline state, including sa...
   Found op http://www.encyclo.co.uk/webster/C/166
   
   
3. 
   corundum
   Native crystalline aluminum oxide. ... Origin: Hind. Kurand ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?corundum
   
   
4. 
   Corundum
   • (n.) The earth alumina, as found native in a crystalline state, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the...
   Found op http://thinkexist.com/dictionary/meaning/corundum/
   
   
5. 
   corundum
   naturally occurring aluminum oxide mineral (Al2O3) that is, after diamond, the hardest known natural substance. Its finer varieties are the gemstones ... [4 related articles]
   Found op http://www.britannica.com/eb/a-z/c/146
   
   
6. 
   Corundum
   Corundum is a crystalline form of aluminium oxide ({chem|Al|2|O|3}) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colors when impurities are present. Transparent specimens are used as gems, ca...
   Found op http://en.wikipedia.org/wiki/Corundum
   
   
7. 
   corundum
   Corundum. Credit: Mineral Information Institute A crystalline (rhombohedral) form of aluminum oxide (alpha-Al₂O₃). The corundum structure has close-packed oxygen with aluminum in octahedral holes. Mineral varieties of corundum include ruby, sapphire...
   Found op http://www.daviddarling.info/encyclopedia/C/corundum.html
   
   
8. 
   corundum
   corundum (kurŭn'dum) , mineral, aluminum oxide, Al2O3. The clear varieties are used as gems and the opaque as abrasive materials. Corundum occurs in crystals of the hexagonal system and in masses. It is transparent to opaque and has a vitreous to adamantine luster. The transparent gem vari...
   Found op http://www.infoplease.com/ce6/sci/A0813680.html
   
   
9. 
   Corundum
   Corundum is a form of aluminium oxide common as an accessory mineral in metamorphic rocks and as an original constituent of certain igneous rocks. Pure corundum is colourless, but colour differences due to the presence of other elements give rise to several varieties of gem, notably, ruby and sapphi...
   Found op http://www.probertencyclopaedia.com/browse/HC.HTM
   
   
10. 
    corundum
    Type: Term Pronunciation: ko-rŭn′dŭm Definitions: 1. Native crystalline aluminum oxide.
    Found op http://www.medilexicon.com/medicaldictionary.php?t=20827
    
    
11. 
    corundum
    Native aluminium oxide and the hardest naturally occurring mineral known, apart from diamond (corundum rates 9 on the Mohs scale of hardness); lack of cleavage also increases its durability. Its crystals are barrel-shaped prisms of the trigonal system. Varieties of gem-quality corundum are ruby (red...
    Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0027104.html
    
    
12. 
    corundum
    The most prestigious sapphires, ranging in colour from clear cornflower to deep blue are the 'Kashmir blue' sapphires, imported to Europe from India since 1862.Corundums can be artificially produced, but under a microscope reveal curved striation and gas bubbles which do not occur in the natural sto...
    Found op http://www.antique-marks.com/antique-terms-c.html
    
    
13. 
    corundum
    1) Abrasive mineral 2) Corundom 3) Mineral
    Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/corundum/1
    
    

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