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larvikite

noun lar·vik·ite \ ˈlärviˌkīt \
variants: or laurvikite \ˈlau̇(ə)rv-\
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Definition of larvikite

plural -s
: an alkali-syenite rock composed chiefly of cryptoperthite or anorthoclase in rhombic crystals and widely used as an ornamental building stone

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Origin and Etymology of larvikite

German larvikit, from Larvik, Norway, its locality + German -it -ite

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