- "Raw glass is similar to raw ebony, but less well-known. Ebony is jet black, while glass is a milky translucent green. Less durable, but much lighter and more flexible than ebony, glass is used primarily to make the distinctive, elegant glass armors and weapons of High Elven design."
Raw glass is a valuable commodity, actually moreso than raw ebony when you consider the value:weight ratio, since Glass is 1/5th the weight of ebony and just as valuable. It is not sold by any restocking vendors, though they will buy it from you if you have any. The most abundant sources are in mines, though these tend to be heavily guarded. They can also be found in barrels and other containers in Dwemer ruins, though these are less predictable. If you have the Tribunal expansion, you can use it to have custom glass armor crafted for you by Bols Indalen at the Craftmen's Hall in Godsreach.
A special kind exists, which looks exactly the same except for the ID:
ingred_raw_glass_tinos. 10 samples of this are found in a chest in Beshara, and they are needed for The Angry Trader quest. (You can mix these with regular raw glass to make a potion with all four effects, but this will prevent you from completing the quest. Also, such a potion would have only one beneficial effect, so it would be somewhat of a waste anyhow.)
Ore rocks can contain up to 8 Raw Glass each, though they average around 5 or so. These can be found in the following locations:
Loose samples can be found in the following locations: