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Originally posted by yampa
Apparently the balls were clay clad with the mineral Pyrite which has now decomposed:
The Maya made mirrors from Pyrite.
Originally posted by coredrill
How did you come to this conclusion that these balls were clad in Pyrite????
Did you actually read the papers?
The composition of the balls is a Ball of Clay covered in yellow material called JAROSITE
Remember JAROSITE and Not PYRITE!!!
Same rock specimen as above, showing the outside surface. The yellow-brown stain on the rock surface is formed as the pyrite and marcasite decompose in rainwater to jarosite (yellow sulphate mineral) and limonite (brown rusty iron oxide).
Originally posted by coredrill
reply to post by yampa
Does the wiki article state pyrite?
Iron sulphides are a group and to imply that the Clay balls were covered in Pyrite because jarosite is a by product of oxidation of iron Suphides.
Then why didnt you state that the clay balls were covered with Marcasite, which also is a Iron Sulphide?
Just because, a shiny compound of Pyrite is more attractive than a non shiny compound of Marcasite, right???
George Cowgill, professor emeritus at Arizona State University, told Discovery News the find was “unique”.
He said: “Pyrite was certainly used by the Teotihuacanos and other ancient Mesoamerican societies. Originally the spheres would have shone brilliantly. They are indeed unique, but I have no idea what they mean.”
The walls of the tunnels are covered in a mineral powder made up of magnetite, pyrite and hematite.
Monument 5 depicts a reptilian creature, perhaps the archetypical Mesoamerican feathered serpent, devouring (or, less likely, disgorging) a human. The creature has an elongated snout with large fangs, and triangular markings towards its tail as well as what appear to be fins or wings.
Originally posted by lostinspace
reply to post by yampa
They may have shimmered like balls of fire in the presence of flame or sun. It could have been similar to this ball of fire in this image at Chalcatzingo, a Mesoamerican site dating back to 1500 BCE.
Sketch of Monument 1, El Rey, at Chalcatzingo. The ball of fire is sitting on the flying cave.