Uranium Glass

Uranium glass is a type of glass. Real uranium glass isn't actually harmful, nor is it in the game. It is tinted green and is similar to didymium glass.

This glass does not generate naturally as a part of buildings.

Usage
Maybe for decoration, or just for having reinforced windows.

Trivia

 * Uranium glass is an actual thing, and sounding dangerous, is safe.
 * MCE added it as he thought it would be cool. Also, to have another glass type.