Japanium

Japanium is a fictional element existing in the Mazinger Series. It is the prime ingredient in creating Super Alloy Z.Japanium was formed when a meteor collided into Mt. Fuji. The minerals within the meteor mixed with the elements in the mountain creating a new element. A mining expedition headed by Professor Juzo Kabuto discovered the element where the professor named it after the country it originated in. The professor would then use this new element to create the ultra durable Super Alloy Z.