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

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