A rare mineral, well known throught the universe, but not often seen.
Star Crystal is an element that is clear and translucent when inactive, and a translucent white when giving off energy. In either state, it often has a rainbow shine to it an refracts light like gemstones do. The crystals themself vary to much degree in size, shape, about of energy they give off, and the amount of time they stay active without being 'provoked'.
While Star Crystal is considered invulnerable to other elements, it can cut by other Star Crystal. The crystals vary in strength and stronger one can cut weaker ones, but they haven't yet been affected by other forms of matter.