lar·vik·ite \ˈlärviˌkīt\noun orlaur·vik·ite\ˈlau̇(ə)rv-\ (-s) Etymology: German larvikit, from Larvik, Norway, its locality + German -it -ite : an alkali-syenite rock composed chiefly of cryptoperthite or anorthoclase in rhombic crystals and widely used as an ornamental building stone