Glass

Glass is a decorative fully transparent block.

Obtaining
Glass will only drop itself if it is broken with a tool enchanted with silk touch, otherwise it will drop nothing.

Trading
Librarian villagers will trade 4 to 5 glass blocks for 1 emerald.

As of, villager librarians will trade 3 to 5 glass for 1 emerald as part of their tier 3 trades.

Usage
Most blocks dependent on a block cannot be placed on glass. The only exceptions are torches and redstone torches, which can be placed on top of glass, but not attached to their sides.

Glass blocks adjacent to other glass blocks are invisible when viewed through glass.

Video
Note: This video is outdated as it does not mention the crafting recipes of beacons, daylight sensors, or stained glass.

Trivia

 * Glass placed next to water running downwards will make the water run more quickly and violently.
 * When Glass is placed over a dropped item, the item is trapped inside the glass but can be retrieved normally.
 * A sword breaks glass slightly faster than a pickaxe.

Glas Cristal Verre Üveg Vetro Glass 유리 Glas Szkło pt-br:Glass Стекло 玻璃