Yeah BA I had to go look it up LOL it ain't funny but I laughing anyway.
A natural mineral called desert glass is tinted deep amethyst by the rays of the sun. Certain types of window glass turn blue or purple or rosy pink. This happens when there are traces of manganese in the glass making ingredients. Iron Impurities add a greenish tint, and a trace of manganese dioxide is added to counteract this and Clear the glass. The iron and manganese dioxide react together and change each other.
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If you believe everything you read you are reading to much.
Treasure is a Harsh Mistress
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