The mysterious spheres lay in both the north and south chambers. Ranging from 1.5 to 5 inches, the objects have a core of clay and are covered with a yellow material called jarosite.
“This material is formed by the oxidation of pyrite, which is a metallic ore,” Gómez Chávez said. “It means that in pre-hispanic times they appeared as if they were metallic spheres. There are hundreds of these in the south chamber.”
Story: Rosella Lorenzi, Discovery News | Photo: DMC, INAH/M. MARAT