[mass noun]a very hard, granular, crystalline, igneous rock consisting mainly of quartz, mica, and feldspar and often used as a building stone 花岗岩,花岗石 ■used in similes and metaphors to refer to something very hard and impenetrable 坚硬的;难以穿透的 [as modifier]a man with granite determination. 有着花岗岩般坚定决心的男子。