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