Rapakivi granite is a hornblende-biotite granite containing large round crystals of orthoclase each with a rim of oligoclase (a variety of plagioclase). The name has come to be used most frequently as a textural term where it implies plagioclase rims around orthoclase in plutonic rocks. Rapakivi is a Finnish compound of "rapa" (meaning "mud" or "sand", while rapautua means "to erode") and "kivi" (meaning "rock"),[1] because the different heat expansion coefficients of the component minerals make exposed rapakivi crumble easily into sand.[2]
Rapakivi was first described by Finnish petrologist Jakob Sederholm in 1891.[3] Since then, southern Finland's rapakivi granite intrusions have been the type locality of this variety of granite.[4]
Rapakivigranite is a hornblende-biotite granite containing large round crystals of orthoclase each with a rim of oligoclase (a variety of plagioclase)...
type of granite Orbicular granite Quartz monzonite – Type of igneous rock Rapakivigranite – Type of igneous rock Subsolvus – Two feldspar granite Geology...
emplaced during the Svecokarelian orogeny. Following this last orogeny rapakivigranites intruded various locations of Finland during the Mesoproterozoic and...
analogue considered to theoretically represent the Earth's upper mantle Rapakivigranite – Type of igneous rock Rhomb porphyry – Textural form of igneous rock...
often occurs in association with norite, anorthosite, charnockite and rapakivigranite in Proterozoic metamorphic belts. It is characterised by the presence...
of felsic or intermediate rock types, such as granite, quartz monzonite, or diorite (see also granite dome). Although they may appear uniform, batholiths...
for a total of approximately 13 metres (43 ft). For the pedestal, a rapakivigranite monolith boulder known as the Thunder Stone (Russian: Гром-камень,...
Pietilä. This example of organic building makes use of the Finnish rock Rapakivigranite and includes animal shapes and glacial patterns. Cloud Art Museum (2020) :...
occurrences at Vaasa, on the west coast of Finland. Bohus granite Jotnian Rapakivigranite Satakunta dyke swarms Öhman, T.; Preeden, U. (2013). "Shock...
(derivative of word pulkka) puukko - traditional Finnish sheath knife Rapakivigranite - a granite rock in petrology taimen - a species of salmon living in Siberia...
to metamorphism. Stratigraphically, Jotnian sediments overlie the rapakivigranites and other igneous and metamorphic rocks and are often intruded by...
are filled with sediments, between Pleistocene sediments and crushed rapakivigranite bedrock there is a layer of Paleozoic (Ordovician) limestones. This...
quartz, epidote, and calcite in veins in granite at Arendal in Norway. The distinctive texture of rapakivigranite is due to oligoclase rims on orthoclase...
recognized as metamorphic Iron-rich felsic rocks, including monzonite and rapakivigranite Iron-rich diorite, gabbro, and norite Leucocratic mafic rocks such...
place during the Svecokarelian orogeny. Following this last orogeny Rapakivigranites intruded various locations of Finland during the Mesoproterozoic and...
geological complex located in Uruguay made up of various plutons including rapakivigranite and quartz syenite. The batholith is of Late Paleoproterozoic age....
period fluctuations between low- and high-temperature compositions. In rapakivigranites, phenocrysts of orthoclase are enveloped within rinds of sodic plagioclase...
are treeless rocks with sheer shores. Their sheerness is due to the rapakivigranite splitting in a sharply cubical manner. The national park is known for...
subdued terrain already during the late Mesoproterozoic, when the rapakivigranites intruded. Further erosion made the terrain rather flat at the time...
that break off the Rotes Kliff - such as flint, rhomb porphyry or Rapakivigranite - still enable an accurate determination of their origin to be made...
weighs about 446 tons according to the latest data. It is made of Rapakivigranite. Its reddish mass includes large crystals of potassium feldspar surrounded...
subdued terrain already during the Late Mesoproterozoic when the rapakivigranites intruded. List of shields and cratons Cratonic sequence "Definition...
porphyries, which lie at the top the pile, share their origin with the rapakivigranites found nearby. An exhumed Subjotnian erosion surface is exposed on...
studied the Alnö Complex, Norra Kärr Alkaline Complex and various Rapakivigranites. In a 1948 publication on Alnö, von Eckermann correctly claimed a...
rock of the park is the granite of Nordingrå, the park belonging to the Nordingrå massif. It consists of a rapakivigranite, formed about 1500 million...
1127/ejm/7/1/0043. ISSN 0935-1221. Emslie, R. F. (1978). "Anorthosite massifs, rapakivigranites, and Late Proterozoic rifting of North America". Precambrian Research...
so-called Baltic Shield) were often of mixed composition, with layers of granitic rock being interleaved with metamorphic rock. Sederholm termed these as...
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