Geopolymer Theory — Cast Stone Hypothesis

Materials scientist Joseph Davidovits proposed in 1979 that the pyramid blocks were not quarried and transported but rather cast in place like concrete. His "geopolymer" theory suggests the Egyptians dissolved limestone in natron (a naturally occurring sodium compound found abundantly in Egypt), mixed it with lime and water, then poured it into molds. Evidence: air bubbles and density variations within blocks (consistent with casting); organic fibers found embedded in stone (impossible in natural rock); chemical analysis showing elevated sodium and moisture content; some blocks have no visible tool marks; the precision of joints is easily achieved with cast stone. Counter-evidence: quarry marks exist; tool marks are found on many blocks; quarries at the Giza plateau show where material was removed.