What's the difference between plain glass and crystal glass?

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Common window glass is made from a mixture of sodium and calcium silicates, whichare made by melting sand, sodium carbonate (soda ash), and limestone together ... user.intop.net/~jhollis/stainedglass.htm ... Crystal is made from the same basic material as glass but lead is added to fine crystal which adds sparkle and strength. Heat-resistant ... www.cleanuppages.com/clean/glass.htm - 20k The lead crystal is made from the purest materials available, a secret blend of silica sand, lead oxide and other agents. This gives the exquisite sparkle, clarity and weight that is expected from English Lead Crystal. Most of our crystal is 34% lead, apart from glassware and decanters at 24%. http://www.eshopone.co.uk/home_derwent.html Dec 28 02, 8:47 AM

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