NYK and Astomos Energy have named their second jointly owned large liquefied petroleum gas (LPG) carrier Gas Amethyst at the Sakaide Works of Kawasaki Heavy Industries.Following Gas Garnet vessel, which was delivered in March this year, Gas Amethyst is the second jointly owned LPG dual-fuel vessel to be delivered this year and the fourth LPG dual-fuel vessel for Astomos Energy.Gas Garnet is 229.