http://www.threedollarsquirrel.com/glass-mold/
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Could I make glass with sand in a mold struck by lightning?
If I observed all the safety protocalls, and filled a metal mold with sand, that was connected between a lightning conducter and earth, would the sand turn to glass in the mold when lightning struck the conductor?
Theoretically, it is possible. However, it is a difficult engineering project to get it to heat the mold correctly. In addition, you will have to somehow retain the heat while channeling away the electrical current.
Just so that you know, lightning strikes do produce glass tubes naturally on rare occasion when lightning strikes sandy soil. The resulting glass is called fulgurite.
Casting Glass in Ceramic Molds