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rapakivi n.

from rapakivi: a hornblende-biotite granite or quartz containing large, rounded crystals; wiborgite; igneous rock [Finnish rapa "mud, sludge" + kivi "stone, rock"]. This entry suggested by Otso Havu.

• "From Labrador to California (and beyond?) hundreds, perhaps thousands, of anorthosite-syenite and rapakivi granite plutons with surface diameters up to 100 km perforated the continental crust in a belt at least 6000 km long and 1000 km wide." Ronald G. Quisling, Continental Tectonics.
• "To the south of this arc lies a broad zone with thrusted gneisses intruded by tin-bearing crustal-melt granites, called rapakivi granites after their coarse, zoned feldspar megacrysts (i.e., crystals that are significantly larger than the surrounding fine-grained matrix)." "Precambrian time", Britannica.com.
• "The rapakivi granites of the Korosten pluton in the Ukraine are rich in vuggy pegmatites containing yellowish green to olive-green beryl crystals up to 1 meter and champagne to blue and bi-colored topaz up to many kg in weight." Peter Lyckberg, "Gem pegmatites of Ukraine, Kazakhstan and Tajikistan", Mineralogical Record, Jan.1, 2001, p.45.
• "Loviisa Power Station - Final Disposal of Reactor Waste: On the Age and Origin of Groundwater from the Rapakivi Granite on the Island of Haestholmen" T. Kankainen, Voimayhtioeiden Ydinjaetetoimikunta.
• "This quarry exposes coarse adamellite with excellent rapakivi texture on the north side of Granite Quarry Road about 6 kilometers north of Waupaca (NW 1/4 sec. 4 T.22N. R.12E.): allanite, apatite, biotite, fluorite, hornblende, ilmenite, magnetite, plagioclase, potassium feldspar, quartz, titanite, zircon (Greenberg et al. 1986)." William S. Cordua, "Wisconsin Mineral", Rocks & Minerals, Nov. 1988.