"But most scientists and geologists have commented that granite when melted to liquid state reforms into glass or other crystals. Molten lava from what I read if it falls into cold water and solidifies that way does not form crystals as such as if it cools up on dry ground over time. Or something to that effect.
I'm sure DD would have some comments about this as well."
DD gave you a dose on that here
As far as melting granite... not a simple thing to do at scales needed for construction, etc. with their tool set. But I would imagine small molds could be made of wood or soapstone and then have partially cooled lava that is still plastic moved into the mold. people still handle molten lava in buckets sometimes. If lava cools slowly, it forms crystals, but if it is doused with water it solidifies without crystalline structure, and forms rocks such as obsidian or dacite that are devoid of crystalline structure. https://investorshub.advfn.com/boards/read_msg.aspx?message_id=167343669
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