Re: [meteorite-list] Heat-treating tektites

[tracy latimer]

I know that old glass bottles (besides going purple) will also develop a 
metallic rainbow patina from being exposed to UV radiation and weak acids, 
as they might encounter after years in a dump.  Considering that tektites 
have been around for thousands of years longer than man-made glass, it's not 
surprising that some would develop the same 'fumed' effect.

Tracy Latimer



The last post clarifies the question a bit.  A few
years ago I received a large shipment of Lei gong mo.
Included with these were a couple of dozen specimens
with strong carnival-glass-like patinas, a full
rainbow of submetallic colors.  I have seen weaker
examples of this sort of patina on old bottles that
have been through fires.  My guess was that the
tektites may have been through a warehouse fire or
some such thing.  Clearly there is some process that
will cause tektites to develop carnival-glass type
films, and I don't think it is a natural process or we
would see this more often.  While not exactly a change
in the glass color, this can yield a profound change
in appearance.  I would be interested to hear if
anyone knows anything about the manufacture of
carnival glass.
Cheers,

Norm Lehrman
(http://tektitesource.com)
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