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glass with an iridescent surface due to a thin film of metallic oxides
Having colors like the rainbow; exhibiting a play of changeable colors; nacreous; prismatic; as, iridescent glass.
You can put ANY type of glass in a microwave! Just be careful not to put it near a stove .
Depending on the quality of the glass, light is reflected and refracted at different angles, resulting in the shimmer.
Tiffany glass
http://www.theglassmuseum.com/august.htm