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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