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Like halite, it forms clear, transparent crystals that are much softer than glass and exhibit good cubic cleavage. The only easy way to distinguish the two is by their taste. Halite is salty, while sylvite is quite bitter.
The crystal structures of galena (PbS) and halite (salt or NaCl) are identical, so it is not surprising that the two exhibit similar perfect cubic cleavage. Both minerals will break along three directions of weakness that meet at right angles.