daguin
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k-shell said:so theres more in mirror glass then just SiO2???
Most commercial "glass" would be considered a borosilicate. As such it has, at least, boron in the mix. You have to pay "extra" for the purer "quartz-type glass" (only SiO2). It's one of the reasons that many mirrors used in lasers are so expensive. They are "quartz" as well as being ground exceptionally flat. In addition, commercial "glass" has many other additives to make it "do" what is desired (flow, float, skin, etc.)
Peace,
dave