Marvelite

Marvelite is a rare mineral created from the destruction of multiple Marvel worlds (TV shows, and different comic series).

Marvelite seems to contain the essence of various heroes. When someone comes into physical contact with the material, they sometimes either gain super powers, or attributes similar to a certain hero, the most common being the Avengers themselves.

Marvelite seems to go into some sort of "sleep" mode once it powers up an individual. The essence remains, it's just not as active as it was before. The essence can be extracted from the rock.

One of the biggest cases of people being exposed to Marvelite are the Numericals that are part of the Cure Alliance.