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They still are. Just melted stone.
Silica is a mineral. aka Quartz and it will melt. Stone jugs are made from clay and is vitrified not melted. its fired in a kiln like brick.
Well, “vitrified” literally means made glassy, and the process involves melting the silicates in the clay, so there are some similarities.
Only in process and loosely at that. Vitrified clay or brick if you prefer is much harder than silica glass.
Reading these comments you can see who the party people are and the party poopers are
You must be fun at parties!
No I actually mean that, I would listen to this shit drunk until way early morning.
Same I bet they just laugh and laugh.
Screw that geology rocks!