Colorless

Colorless, otherwise known as Normal or No Element, is an Anti-Element and lacks Elemental Powers of any kind. A Colorless Crystal exists, and it serves as the base for many Elemental Crystals.

Colorless Crystal
The Colorless Crystal has a chrome-like grayscale color scheme. It has a circle with one big cross-shaped lines on it, and another, shaped like an "X", which represents its anti-element.

Trivia
This is the first Elemental Crystal that lacks any other type of color, except being grayscale.

The Steel Crystal, also has a gray color scheme but has a yellow shine and blue shadows.

It is also based on the element type with the same name in the long-running Pokemon Trading Card Game, and is the TCG counterpart of the Normal Type in the games.