1) Abrasive 2) Abrasive mineral 3) Beautiful stone 4) Corundom 5) Cut mineral 6) Decorative stone 7) Gemstone mineral 8) Gemstone 9) Industrial mineral 10) Jewel mineral 11) Jewel 12) Luminescent mineral 13) Mineral gemstone 14) Mineral 15) Mineral jewel 16) Polished jewel 17) Polished mineral 18) Precious stone
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https://www.crosswordclues.com/clue/corundum
1) Alumina 2) Corundom 3) Emery 4) Oxide 5) Sapphirine
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https://www.crosswordclues.com/clue/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 transparent materials, but can have different colors when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange. All ot...
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http://en.wikipedia.org/wiki/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 diamond.
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http://thinkexist.com/dictionary/meaning/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 stone.
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http://www.antique-marks.com/antique-terms-c.html
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 on
http://www.britannica.com/eb/a-z/c/146
Corundum. Credit: Mineral Information Institute A crystalline (rhombohedral) form of aluminum oxide (alpha-Al
2O
3). The corundum structure has close-packed oxygen with aluminum in octahedral holes. Mineral varieties of corundum include ruby, sapphire...
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http://www.daviddarling.info/encyclopedia/C/corundum.html
Native crystalline aluminum oxide. ... Origin: Hind. Kurand ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
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 stone.
Found on
http://www.encyclo.co.uk/visitor-contributions.php
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 sapphire , which is the fine blue variety; the
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http://www.encyclo.co.uk/webster/C/166
Type: Term Pronunciation: ko-rŭn′dŭm Definitions: 1. Native crystalline aluminum oxide.
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http://www.medilexicon.com/medicaldictionary.php?t=20827
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 sapphire. The deep red ruby (corundum tainted with chrom...
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http://www.probertencyclopaedia.com/browse/HC.HTM
A mineral that comes in several colours including ruby and sapphire, depending on the metallic oxides that it contains. Corundum that does not contain any oxides is colourless and known as pure corundum or white sapphire. Rubies contain chromic oxide, blue sapphires contain oxides of titanium and yellow sapphires contain ferric oxide. Corundum has ...
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http://www.saffronart.com/sitepages/jewelry/glossary.aspx
Aluminum oxide, alpha
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http://www.translationdirectory.com/glossaries/glossary075.htm
Native alumna, or aluminum oxide, Al2O3, occurring as rhombohedral crystals and also in masses and variously colored grains. Applied specifically to nontransparent kinds used as abrasives. It is hardest mineral except the diamond. Corundum and its artificial counterparts are abrasives especially suited to the grinding of metals.
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
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) and sapphire (any colour other than ...
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https://www.encyclo.co.uk/local/21221
(Aluminum Oxide) When someone lists the most famous gemstones such as diamond , topaz , aquamarine , emerald and garnet , corundum does not usually get mentioned. However, its two varieties are sure to be on
any list of gemstones. The red variety of corundum is known as ruby and all the other colors...
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https://www.encyclo.co.uk/local/23719
a common mineral, aluminum oxide, AlO, notable for its hardness: transparent varieties, as sapphire and ruby, are used as gems, other varieties as abrasives: often made synthetically.
Found on
https://www.infoplease.com/dictionary/corundum
No exact match found.
