So why use mica?
Sheet Mica is used in electrical components today.
Its usefulness in these applications is derived from its unique electrical and thermal insulating properties and its mechanical properties, which allow it to be cut, punched, stamped, and machined to close tolerances.
Specifically, mica is unusual in that it is a good electrical insulator at the same time as being a good thermal conductor.
The leading use of block mica is an electrical insulator in electronic equipment.
Most importantly, researchers have not found Mica in any other archaeological site in the vicinity, or in the Americas.
Why there are traces of Mica at the Pyramid of the Sun and other constructions in Teotihuacan is a mystery that archaeology has yet to explain properly.
Mysteriously, the type of Mica used in Teotihuacan is believed to have originated in Brazil.
“Mica has many uses in our world as we know it today. It can be found in the making of lamp shades to insulator wrapping for wires. Here are few more uses of mica in our society today. It is used to make speaker diaphragms, snow flakes, heat shields, paper, and wave plates. Most paint today can be contributed to mica. Mica is now even being studied for its uses with nuclear activities. Mica is found in rubber products, oil well drilling additives, and in roofing products. When nuclear reactors leak they release radioactive isotopes cesium-137 into the air. “Two researchers have now discovered a form of mineral mica that acts as a highly selective sieve for capturing cesium ions.” (Science News, 2003) Furthermore, mica might help us to be able to safely clean up radioactive spills with out doing any harm to us.”
Yet despite its splendour, Teotihuacan has remained a mute, baffling mystery.
The ancient Teotihuacanos did not leave behind any written records.
Aside from painstaking forensic and archaeological analysis, we have no way of knowing who founded the city, what caused its decline and eventual demise around 450 AD, or even what the real name of the place was. (The name came from the Aztecs 700 years after it was abandoned: Teotihuacan, “the place where the gods were created.”)