[Ichneumon]

Transparent Aluminum, RIP Scotty

Actually, transparent aluminum has already been made. Well, okay, transparent aluminum oxide, but close enough to justify raising a glass to Scotty...

[Final Authority]

It is called sapphire and is a naturally occurring compound and also one that has been synthesized for decades. If you buy an expensive Swiss watch you will read the time looking through the transparent aluminum oxide crystal.

If you have your groceries scanned at the market the window that the laser transmits through is synthetic sapphire.