[meteorite-list] Any interesting (?) Chinese tektite

[Göran Axelsson]

It looks like a surface effect of some kind and might be a side effect 
of cleaning.

I've seen similar effects on minerals and slag where a thin film or 
layer on the surface works like an optical filter. If a surface is 
covered in a thin layer of a substance with a different optical index it 
will work as a filter and reflect certain wavelengths. If the thickness 
is varying it will create a rainbow effect, much like the last of your 
pictures.
It doesn't need to be covered in a foreign substance, it could also be 
an alteration that is only affecting the surface.
The best examples of this phenomena is a drop of oil on a water surface 
or the thin wall of a soap bubble.

/Göran

MARK BOSTICK wrote:
> Hello Dirk,
>
> Dirk asked; "Are you sure it is within the glass or some substance on 
> the surface only?'
>
> It does not appear to be on the surface, but I am not sure how the 
> tektite was cleaned.  I did not get the tektite somehwhat dirty as 
> most chinese tektites usually are. Dimples were clean.
>
> I just added a forth photograph, using the camera's flash...and 
> holding it to try to give the camera another color to help show a 
> little more color.  (My old Nikon finally broke after much abuse and I 
> do not really like my current camera.)
>
> http://www.meteoritearticles.com/coltektitechin76g.html
>
> If you would like Dirk, I could send it to you, as you much more 
> experienced with tektites then I am.
>
> Clear Skies,
> Mark
> www.meteoritearticles.com
>
>
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