In ancient times the Sinai mines were rich in deposits of and , neede for the production of synthetic zeolites. The mines also contained the arsenic … - Joseph Davidovits

The science that made the pyramids possible was chemistry, or, more precisely... alchemy. ...[T]he legendary Philosopher's Stone represents the last misinterpreted vestiges of the alchemical science that flourished during the Pyramid Age ...Technically alchemy encompasses historical chemical developments. ...There were great alchemical achievements during antiquity.

reacts with lime and water to produce caustic soda, the main ingredient for alchemically making stone. An abundance of lime would have been available by calcining in simple hearths.

The second verb is... khusi that means to erect, to build, to construct, and you see that the verb has a determinative that is a man pounding something in a mold. So this is the making of agglomerated stone. This is the making of bricks, and this is the making of stone.