Transparent aluminum is so weird, a piece of it was once passed around our office. It felt heavier and colder than I expected, which I guess is probably because it's much denser than most types of glass (I think it's only comparable to optical glass so it would be close to holding a high quality glass lens) and it looks like the thermal conductivity is way higher.
No, Glass has an amorph atomic structure, its tecnically an ultra dense liquid, metal always has a cristaline structure, way different, even in it's transparent form, Saphires and Rubies are also tecnically transparent Aluminium.
What do you mean no? Everything I said is true - I'm just describing my firsthand impression. Nowhere did I say transparent aluminum is a type of glass? I was just describing why it feels heavier and colder than you would expect since it looks like glass, of which most are less dense and less thermally conductive compared to transparent aluminum, which is not glass but makes sense to compare to in order to convey what handling a piece feels like.