![Ancient organomineral geopolymer in SouthAmerican](/3wzg0da/488.jpg)
Ancient organomineral geopolymer in SouthAmerican
· The most controversial aspect of the Pumapunku site of Tiahuanaco (Bolivia) is found in puzzling small items made of andesite volcanic stone (the "H" structures). The SEM study of this gray andesite shows the presence of organic matter which comprises carbon, nitrogen, and mineral elements: Na, Mg, Al, Si, P, S, Cl, K, Ca.