A mesmerizing piece of Rainbow fluorite.

Structural defects within the lattice, known as colour centres, have a similar effect.

Fluorite comes in a wide range of colors and has consequently been dubbed "The most colorful mineral in the world". Every color of the rainbow in various shades are represented by fluorite samples, along with white, black, and clear crystals. Pure Fluorite is colorless; the color variations are caused by various various impurities.