rapakivin.

Brit.

/ˌrapəˈkiːviː/,

/ˈrapəˌkiːviː/, U.S.

/ˌræpəˈkivi/,

/ˈræpəˌkivi/

Forms: 1700s– rapakivi, 1800s rappakivi, 1800s– rapakiwi (now rare), 1800s– rappakiwi (rare). Also with capital initial.

Origin: A borrowing from Finnish. Etymon: Finnish rapakivi.

Etymology: < Finnish rapakivi crumbly stone (1740 in a Swedish context; 1694 in a Swedish context as rapakiwi in U. Hjärne Kort Anledning till Åtskillige Malm och Bergarters i. v. sig. B2^v) < rapa mud + kivi stone.

Geology.

In full rapakivi granite. A form of granite originally identified in southern Finland, characterized by large ovoid crystals of potassium feldspar surrounded by plagioclase. Frequently attributive.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > plutonic rocks > granite > varieties of

moorstone1461

silver stone1758

granitell1794

granitoid1794

rapakivi1794

ophthalmite1811

protogine1823

pegmatite1824

potash-granite1845

beresite1849

granitite1875

greisen1878

trowlesworthite1884

microgranite1888

charnockite1893

alaskite1900

Dartmoor granite1904

plagiogranite1959

1784 R. Kirwan Elements Mineral. i. viii. 149 A stone of this sort which moulders by exposures to the air, is found in Finland, and is said to contain sometimes saltpetre, and sometimes common salt, it is there called Rapakivi.]

1794 R. Kirwan Elements Mineral. (ed. 2) I. 345 The aggregate of felspar and mica is called Rapakivi.

1838 Edinb. New Philos. Jrnl. 25 296 There is also a species of granite called Rapakivi, which occurs in various parts of Finland, and particularly..two miles to the north of Uleaborg.

1894 Amer. Naturalist 28 58 The Algonkian rocks are all fragmental, and above them are the Rapakivi granite and a diabase.

1906 J. P. Iddings Rock Minerals ii. 487 Quartz..may often be the darkest mineral visible megascopically, as in some varieties of rapakiwi from Finland.

1944 Proc. Geologists' Assoc. 55 74 The typical rock, the rapakivi granite proper, is characterised by abundant large ovoids..of potash-felspar which lie in a matrix of quartz, potash-felspar, plagioclase and dark mica, and, sometimes, hornblende.

1996 European Jrnl. Mineral. 8 443/1 As is common in rapakivi granites, Mount Scott Granite exhibits at least two generations of growth for quartz and feldspars.

This entry has been updated (OED Third Edition, December 2008; most recently modified version published online March 2022).

单词	rapakivi
释义	rapakivin. Brit. /ˌrapəˈkiːviː/, /ˈrapəˌkiːviː/, U.S. /ˌræpəˈkivi/, /ˈræpəˌkivi/ Forms: 1700s– rapakivi, 1800s rappakivi, 1800s– rapakiwi (now rare), 1800s– rappakiwi (rare). Also with capital initial. Origin: A borrowing from Finnish. Etymon: Finnish rapakivi. Etymology: < Finnish rapakivi crumbly stone (1740 in a Swedish context; 1694 in a Swedish context as rapakiwi in U. Hjärne Kort Anledning till Åtskillige Malm och Bergarters i. v. sig. B2^v) < rapa mud + kivi stone. Geology. In full rapakivi granite. A form of granite originally identified in southern Finland, characterized by large ovoid crystals of potassium feldspar surrounded by plagioclase. Frequently attributive. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > plutonic rocks > granite > varieties of moorstone1461 silver stone1758 granitell1794 granitoid1794 rapakivi1794 ophthalmite1811 protogine1823 pegmatite1824 potash-granite1845 beresite1849 granitite1875 greisen1878 trowlesworthite1884 microgranite1888 charnockite1893 alaskite1900 Dartmoor granite1904 plagiogranite1959 1784 R. Kirwan Elements Mineral. i. viii. 149 A stone of this sort which moulders by exposures to the air, is found in Finland, and is said to contain sometimes saltpetre, and sometimes common salt, it is there called Rapakivi.] 1794 R. Kirwan Elements Mineral. (ed. 2) I. 345 The aggregate of felspar and mica is called Rapakivi. 1838 Edinb. New Philos. Jrnl. 25 296 There is also a species of granite called Rapakivi, which occurs in various parts of Finland, and particularly..two miles to the north of Uleaborg. 1894 Amer. Naturalist 28 58 The Algonkian rocks are all fragmental, and above them are the Rapakivi granite and a diabase. 1906 J. P. Iddings Rock Minerals ii. 487 Quartz..may often be the darkest mineral visible megascopically, as in some varieties of rapakiwi from Finland. 1944 Proc. Geologists' Assoc. 55 74 The typical rock, the rapakivi granite proper, is characterised by abundant large ovoids..of potash-felspar which lie in a matrix of quartz, potash-felspar, plagioclase and dark mica, and, sometimes, hornblende. 1996 European Jrnl. Mineral. 8 443/1 As is common in rapakivi granites, Mount Scott Granite exhibits at least two generations of growth for quartz and feldspars. This entry has been updated (OED Third Edition, December 2008; most recently modified version published online March 2022). < n.1794
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