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Please help identify this stone !


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Glass (silica) is used to flux metal when smelting. Molten metals will oxidize rapidly. So silica (quartz, glass, etc.)is added to the furnace to cover the molten metal and keep it away from oxygen. 

The glass in the furnace works exactly like the silica covering an arc welding rod or the shielding gas in a MIG or Heli arc process. Any time you melt or weld metal there is something to keep it from gobbling up oxygen. Smelting under a puddle of molten glass is the cheapest and most popular way to accomplish this.

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