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rapakivi texture

rapakivi texture Rounded crystals of pink, potassic feldspar, mantled by white rims of sodic plagioclase feldspar (occasionally rhythmically zoned with alkali feldspar), and found as large crystals, up to 4 cm in diameter, in a finer-grained, igneous groundmass of granitic composition. The term was applied first to granites from eastern Finland.

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