Plexidiamond

Plexidiamond is an extremely hard material. In fact, it is the hardest manmade material in existance.

Functionality
Plexidiamond is normally see-through, but can be turned into a dark blueish color by heating it up past the boiling point of water (212 degrees Fahrenheit or 99.98 degrees Celsius). Plexidiamond is sometimes used as the outer cover of an atmosphere shield or in spaceships as a middle layer.

Appearance
Plexidiamond is see-through with a slight sparkle.

Trivia

 * This is SCP's first page! :D