The Purple Blast Shield appears in Metroid Prime Hunters, first encountered on Alinos. The Judicator is required to disable the shields and progress. It is likely that the shields could also be opened by other freezing weaponry, such as the Ice Beam, Dark Beam and Ice Missiles. There are also Purple Force Fields.
Purple Blast Shield
Metroid Prime Hunters
Analysis indicates the blast shield is impervious to most weapons. A weapon that fires SUPERCOOLED PLASMA may damage it.