Transparisteel/Legends

Transparisteel or transparasteel 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. Transparisteel could be made phototropic, to become more opaque near bright explosions or while traveling through hyperspace. A major component in the make-up of transparisteel was lommite.
Transparisteel was much weaker than its opaque counterpart durasteel. It offered a less clear view than clari-crystalline or glass, but was more resilient.
Darth Krayt encased Kol Skywalker's lightsaber in transparisteel to honor him.[1]
Transparisteel was used in the windows of Skimmersubs.[2]
The High Council Chambers of the Jedi Temple on Coruscant had floor-to-ceiling windows made of transparisteel to withstand the winds at the altitude.[3]
Padmé Amidala had a transparisteel amulet made by her parents when she became the Queen of Naboo.[4][5]