Iridescent Brick

The Iridescent Brick is a cheap brick. It is not strong, and as such can be mined with any pickaxe. They and their walls can either be crafted, or collected from Jungle Shrines in the Underground Jungle.

Trivia

 * "Iridescence" is the property of appearing different colors depending on the viewing angle. A lot of prisms have this factor.
 * In real-life, iridescent tiles are glass ceramics with a rainbow sheen that changes color when looked upon, which are purchased for decorative purposes in a similar manner to oil slicks.