reacts with lime and water to produce caustic soda, the main ingredient for alchemically making stone. An abundance of lime would have been available… - Joseph Davidovits

[T]he pyramid blocks are not natural stone; the blocks are actually exceptionally high-quality concrete—synthetic stone—cast directly in place. The blocks consist of... ninety to ninety-five percent limestone rubble and five to ten percent cement. ...imitations of natural limestone, made in the age-old tradition of alchemical stonemaking. No stone cutting or heavy hauling was ever required...

... form[s]... one of the major areas of materials science. ...Inorganic chemistry concerns basic molecules such as s, metals, s, and minerals. ...[M]ost of the raw materials for geopolymer synthesis are rock-forming minerals. ...There are numerous reasons for being interested in mineral polymers, more specifically in geopolymers. One is to get fire and heat properties that cannot be covered by organic materials. Another is the bridge... between polymer science and ceramics.

They turned back to mud because mud bricks is also a replica of incarnation, in the materials that belong to the Khnum divinity.