Megacrystalline "tourmaline" at the Zhongshan Station, Antarctica, is in fact kornerupine. The tourmaline is fine-grained and minor in amount and can be classified at least into three types according to its optical properties, composition and textural relations, with the types corresponding with the stages of metamorphism. The mineral is stable in the granulite facies in the area because it is buffered by grandidierite and kornerupine on boron. Some compositional featares of the melt and volatiles in metamorphism and incongruent melting can be reflected by the changes in the composition of tourmaline and the compovents of the mineral assemblages.