The visible light produced by a meteor may take on various hues, depending on the chemical composition of the meteoroid, and its speed through the atmosphere. As layers of the meteoroid are stripped off and ionized, the colour of the light emitted may change according to the layering of minerals. Some of the possible colours and the compounds responsible for them are: orange/yellow (sodium); yellow (iron); blue/green (copper); purple (potassium); and red (silicate).
Source : http://en.wikipedia.org/wiki/Meteoroid
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