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Rapakivi granite

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A term, used as both an adjective and noun, for a variety of granite usually containing amphibole and biotite and characterized by the presence of large oval grains (ovoids) of orthoclase which are usually mantled by plagioclase. Two generations of quartz are often present. From the Finnish word for "rotten stone."

Many of the classical buildings in St Petersburg, Russia, are clad with Rapakivi granite imported from Finland.


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Classification of Rapakivi graniteHide

QAPF_P_3.png

Granite is in section 3 of the QAPF diagram.

Sub-divisions of Rapakivi graniteHide

Mineralogy of Rapakivi graniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
AmphiboleAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Feldspar > Alkali Feldspar > OrthoclaseK(AlSi3O8)
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Silica > QuartzSiO2

Synonyms of Rapakivi graniteHide

Internet Links for Rapakivi graniteHide

 
Mineral and/or Locality  
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