[thackney]

Transparent aluminum is aluminum oxide in crystal lattice.

Also know as industrial sapphire.

High end watch crystals are sometimes made of it.

http://www.gtat.com/products-and-services-sapphire-for-industrial-markets.htm

Al₂O₃

http://www.gia.edu/gia-news-research-Sapphire-Series-Introduction-to-Sapphire-and-Synthetic-Sapphire

[jonascord]

Yeah, yeah, but they're talking to Democrats. These are people who have trouble making that leap from aluminum foil to an organized crystal structure.

Transparent aluminum sounds sexier than sapphire, and when you show a lexan box that they assume is solid, the illusion is complete, and they start looking for it at Home Depot.