Thanks for remembering, I was trying to think of the name.
I searched the article and found one instance of the word geopolymer
Quote:
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According to the caller, the mysteries had actually been solved by Joseph Davidovits, Director of the Geopolymer Institute in St. Quentin, France, more than two decades ago.
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That's the term of art. Rock is generally either sedimentary, metamorphic or igneous. Sedimentary would be easy, metamorphic would require pressure and heat (like a Cinva-Ram press?) but less than igneous which would be like a fired ceramic.
The Egyptians also made bottles out of diorite by the thousands. Not sure how they did that diorite is hard.
https://i.pinimg.com/originals/22/ee...63a9236331.jpg