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Hardened glass is a type of glass that has been chemically strengthened. It is available in clear and colored variants, similarly to normal glass. It is only available in the Education Edition of Minecraft.
Unlike normal glass, hardened glass will drop itself when broken with any tool or by hand. It also takes significantly longer to break.
Most blocks that require placement on a solid block cannot be placed on hardened glass or hardened stained glass. The only exceptions are torches and redstone torches, which can be placed on top of the hardened glass blocks, but not attached to their sides.
Hardened glass blocks adjacent to other hardened glass blocks are invisible when viewed through the glass, but not when viewed through normal glass.