Amber

Amber is a Gem. Besides Orange Torches, Amber cannot be used to make anything else the other gems can be made into, such as Grappling Hooks or Phaseblades, although it can be placed as a decoration like the other gems.

Unlike other gems, amber is never found where it can be mined, and can only be acquired by feeding silt and slush to an Extractinator.

Trivia

 * Amber was most likely added just to create Orange Torches.