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Zircon

Posted by Branko Rieck  
avatar Zircon
February 14, 2011 10:49AM
    
I have noticed that there is a little confusion on the refractive indices of zircon on the web. Mindat lists: nω = 1.925 - 1.961 nε = 1.980 - 2.015 but other sites state nω and nε in reverse order (e.g.: [webmineral.com] ). Could somebody knowledgable comment on this?

Branko
avatar Re: Zircon
February 14, 2011 04:21PM
    
Hi Branko,

Mindat data is correct. Since Zircon is tetragonal, it is uniaxial, that is with a single optic axis. Also, since ε is greater than ω the optic sign is (+). This should be true in all cases. Only when when Zircon is metamict can it show some biaxial characteristics but minor only and e' (ε-ω) should still always be positive never negative. Mindat uses the same optical data for Zircon as is listed for Zircon in Handbook of Mineralogy.

Ron
avatar Re: Zircon
February 14, 2011 04:33PM
    
Ron,

thanks! If the indices of refraction were as stated on webmineral.com, zircon would be optically negative, which is in fact what they claim. So that alone is no clear indication on who is right and who is wrong. But I tend to believe Mindat, because it is almost always correct. The Handbook of Mineralogy is another indication on that.

Branko
Re: Zircon
February 14, 2011 05:03PM
    
Ron is completely right.
mastram hathesh
Re: Zircon
September 26, 2013 11:35PM
i want thermodynamic datas of zircon.
avatar Re: Zircon
September 27, 2013 02:47AM
    
Hi Mastram,

If you are looking for thermodynamic properties of Zircon, try this link and go to page 28 of the paper or page 34 of the pdf under "Ortho and Ring Structure Silicates." Additionally, temp. dependent data sets for Zircon on pages 371-372 of the paper or pages 377-378 of the pdf. Good luck to you.
[pubs.usgs.gov]

Ron
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