rapakivi

noun

ra·​pa·​ki·​vi

¦räpəˈkēvē

plural -s

: a coarse red granite quarried in Finland having curious ovoid ringed feldspars composed of central cores of orthoclase surrounded by a shell of oligoclase and being much used for building in northern Russia

Word History

Etymology

Finnish, from rapa dregs, mud, gravel + kivi stone, rock

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