Transparisteel
From Wookieepedia, the Star Wars wiki.
Transparisteel was a hard and completely transparent metal alloy. This made it a commonly used material for starship viewports, and the windows of strongholds, and other buildings where security was a must. In starship viewports, transparisteel could be made photosensitive to become more opaque near bright explosions, while traveling through hyperspace, and such. A major component in the make-up of transparisteel was lommite.
Transparisteel was marginally less strong than its opaque counterpart durasteel.
The window in Palpatine's office in the Republic Executive Building on Coruscant was made of transparisteel.
Darth Krayt encased Kol Skywalker's lightsaber in Transparisteel to honor him.[1]
