Mica Chambers at Teotihuacan Prove Ancient Alien Theory

Several chambers or rooms have been found underneath the ancient city of Teotihuacan that have mica layered ceilings and walls. Mica is a very heat resistant metal and is used almost exclusively for our space programs so what would our ancestors have needed it for? And how did they even get the mica in the first place since the land in Mexico doesn't have any.

[link to expertspages.com]