Talk:Corundum

From Wikipedia, the free encyclopedia

WikiProject_India This article is within the scope of WikiProject India, which aims to improve Wikipedia's coverage of India-related topics. If you would like to participate, please visit the project page.
Start This article has been rated as start-Class on the quality scale. (add comments)
This article is maintained by the Tamil Nadu workgroup.
More information about this article...


Diamond Corundum is part of WikiProject Gemology and Jewelry, which aims to improve Wikipedia's coverage of Gemstones, Jewelry, and related topics. If you would like to participate, visit the project page.
Start This article has been rated as start-class on the quality scale.
High This article has been rated as high-importance on the importance scale.

Article Grading:
The article has been rated for quality and/or importance but has no comments yet. If appropriate, please review the article and then leave comments here to identify the strengths and weaknesses of the article and what work it will need.
This article is supported by WikiProject Gemology and Jewelry, gemstones subpage.
WikiProject Gemology and Jewelry To-do:

Aren't emeralds a type of corundum too? Chadloder 20:47 Jan 25, 2003 (UTC)

Don't think so. Emerald is a type of beryl (beryllium aluminum silicate) while corundum is aluminum oxide. Perhaps you were thinking of ruby and sapphire, which are types of corundum. -- Heron
Yup, you're right. Sorry. :) Chadloder 20:40 Jan 26, 2003 (UTC)

The Emery article says its mohs hardness is 8, but this article says "Emery is an impure and less abrasive variety, with a Mohs hardness of 9.0." Shouldn't this be changed to 8.0? The hardness of pure corundum is 9.0.

Contents

[edit] Merge suggestion

No! This is a mineralogy article about the naturally occurring mineral, aluminium oxide is a chemistry article about the chemical. Vsmith 15:28, 8 January 2006 (UTC)

Oppose merger I agree with the above poster. Would an article about diamond or charcoal be merged with one about carbon?--24.217.183.224 08:23, 9 January 2006 (UTC)

Oppose merge: there is (potentially) more than enough material to justify two articles; minerals and chemical compounds are usually treated seperately on WP. Physchim62 (talk) 09:14, 9 January 2006 (UTC)

[edit] New Merge Section

(To reduce confusion with above, which is different.)

  • Oppose the merger for the same reasons as the posters in 2006. One is chemistry the other a mineral. It would be more appropriate to merge Transparent alumina into the article on aluminum oxide.Dcmacnut 20:05, 2 March 2007 (UTC)
  • Support If you mean combine the transparent alumina article into this, then I'm in favour
  • Oppose for the same reasons as those of the former merger, Corundum is a Mineral article, and transparent alumina is a chemical article and so are to be treated separately Kevmin 11:08, 6 March 2007 (UTC)
  • Question to you mineral/chemical guys. Is Transparent alumina a variety of corundum? If not then I Oppose a merge. If it is, then I am Neutral but I would then state that somewhere in both articles it should at least state so. right now the only hint is that it is like "sapphire" and "ruby". As a gemstone guy, this is inaccurate. SauliH 11:28, 6 March 2007 (UTC)
  • No, transparent alumina is not a variety of corundum. Corundum is by definition a naturally occurring mineral species as defined by the International Mineralogical Association. Transparent alumina is a artificially created chemical substance and so does not qualify for the term corundum. Kevmin 11:36, 6 March 2007 (UTC)
But it could be correctly termed synthetic corundum? SauliH 18:54, 6 March 2007 (UTC)
Oppose, there is already a section in corundum on synthetic stuff. This transparent alumina would better be merged with the aluminium oxide chemical article for its ceramic and industrial usages. Info on synthetic ruby and sapphire should (and already is I think) be in those gemstone articles. The article transparent alumina seems rather an odd term - should be redirected to aluminium oxide and pertinent material merged wherever it best fits, if not already there. Vsmith 01:08, 7 March 2007 (UTC)
I am still trying to get to grips with what this material is. Does it have the same crystal structure as corundum crystal? If it is a synthetic production of corundum with like crystal structure and chemical makeup then this should be made clear in the article. SauliH 05:27, 8 March 2007 (UTC)
From what I can find this is a man made Al2Os Glass. This means that I is not the same substance chemically as naturally crystalline Corundum, Al2Os, and not classifiable as a mineral under the IMA rules, that it is not anthropogenic in origin and that it has a definable crystal structure Kevmin 10:06, 8 March 2007 (UTC)

[edit] Transparent alumina redirect not logical, Jim

Transparent Alumina is an invention (2004, 3M, a glass; according to the Aluminium oxide article) where as Corundum seems to be about the basic mineral from which Alumina and such can be derived (and associated gems). I would have expected a reference to Star Trek (which had something of that order in one or two of it's films) and the chemical process (assuming a trade secret does not exist that stops us knowing or telling), "rare earth elements" used and industrial uses of said Transparent Alumina. As such arriving on the Corundum page is both confusing and misleading. --Lord Matt (talk) 22:00, 23 November 2007 (UTC)



[edit] To mention

could there be a note somewhere in here saying about the fact it is sometimes used as a callibration material for some X-ray diffraction equipment? —Preceding unsigned comment added by 148.168.40.4 (talk) 09:23, 5 February 2008 (UTC)