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
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Merriam-Webster unabridged
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