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⇱ Rapakivi granite: Mineral information, data and localities.

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Rapakivi granite

A rock subtype
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About Rapakivi graniteHide

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A term, used as both an adjective and noun, for a variety of granite usually containing amphibole and/or biotite and characterized by the presence of large oval grains (ovoids) of orthoclase phenocrysts which are usually mantled by plagioclase (typically oligoclase). 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.


Unique IdentifiersHide

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Mindat ID:
48152
Long-form identifier:
mindat:1:1:48152:0

Classification of Rapakivi graniteHide

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👁 QAPF_P_3.png

Granite is in section 3 of the QAPF diagram.

Sub-divisions of Rapakivi graniteHide

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Mineralogy of Rapakivi graniteHide

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Essential minerals - these are minerals that are required within the classification of this rock:
Amphibole(Na, K, ◻)(Ca,Na)2(Mg,Fe,Al)5((Si,Al)8O22)(OH,F,Cl,O)2
Feldspar > Alkali Feldspar > OrthoclaseK(AlSi3O8)
Feldspar > Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Silica > QuartzSiO2

Synonyms of Rapakivi graniteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:
7 photos of Rapakivi granite associated with OrthoclaseK(AlSi3O8)
7 photos of Rapakivi granite associated with 'Oligoclase'(Na,Ca)[Al(Si,Al)Si2O8]
7 photos of Rapakivi granite associated with BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
7 photos of Rapakivi granite associated with Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
6 photos of Rapakivi granite associated with QuartzSiO2

Internet Links for Rapakivi graniteHide

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mindat.org URL:
https://www.mindat.org/min-48152.html
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References for Rapakivi graniteHide

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Reference List:
Quick NavTopAbout Rapakivi graniteUnique IdentifiersClassification Sub-divisions Mineralogy SynonymsCommon AssociatesInternet Links References
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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