Glass
minecraft:glassGlass is a transparent, solid block obtained by smelting sand or red sand in a furnace. It is a versatile crafting ingredient used to make glass panes, bottles, beacons, daylight detectors, and end crystals, and it does not drop itself when broken unless mined with a Silk Touch tool.
FAQ
How do you make Glass?
Smelt sand or red sand with any fuel source in a furnace to produce one glass block per unit smelted.
Why doesn't Glass drop anything when broken?
Glass drops nothing when broken with a regular tool; only a pickaxe (or any tool) enchanted with Silk Touch will let you collect the block itself.
Does Glass have connected textures?
In Java Edition, glass blocks adjacent to other glass blocks of the same color become invisible where they touch, creating a seamless connected look.
Can mobs see through Glass?
No. Even though it looks transparent to players, mobs treat glass as completely opaque and cannot see through it.