>>13364185yes and obsidian was utilized by the ancient agyptians!
https://www.researchgate.net/publication/335611674_Obsidian_in_Ancient_EgyptObviously they either utilized adjuvants to geopolymerize the granite. or used a low temperature to just soften the stone, before its tas guided into shape
Agyptoloists just assumed its granite, it requires microscopic analysis to tell the difference between natural stone and geopolymer