It is reported that the mineralogic chemistry of the tourmalines in the highpressure(HP)and ultrahighpresure(UHP) gneisses from the western Dabie Mountain.The tourmalinebearinggneisses are darkcolored and occur as interlayer or lentoid mass in the extensive lightcoloredgneisses.They are mainly composed of garnet,biotite,plagioclase,quartz,amphibole and ilmenite,and in the minor of phengite,rutile,chlorite,epidote and apatite,while the tourmaline crystals arescattered.By the electron microprobe analysis,the tourmalines are poorer in aluminum and calcium,richer in magnesium,and belong to dravite;their crystals show weak compositional zonation with calcium increase and sodium decrease from core to rim.In the diagram of tourmaline composition andtheir genetic environments,the tourmalines are formed in the metapelites and metapsammites,whichare consistent with the geologic setting of the gneisses.As for determination of the temperature andpressure in metamorphic rocks by the tourmaline composition,more information and discussion arestill necessary at present.