Rapakivi granite
A rock subtype
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About Rapakivi granite
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.
Many of the classical buildings in St Petersburg, Russia, are clad with Rapakivi granite imported from Finland.
Unique Identifiers
Mindat ID:
48152
Long-form identifier:
mindat:1:1:48152:0
GUID
(UUID V4):
(UUID V4):
e8cda3e7-79e8-4e4c-8749-482733f744bb
Classification of Rapakivi granite
Granite is in section 3 of the QAPF diagram.
Sub-divisions of Rapakivi granite
- Rapakivi granite
Mineralogy of Rapakivi granite
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 > Orthoclase | K(AlSi3O8) |
| Feldspar > Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Mica > Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Silica > Quartz | SiO2 |
Synonyms of Rapakivi granite
Internet Links for Rapakivi granite
mindat.org URL:
https://www.mindat.org/min-48152.html
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References for Rapakivi granite
Reference List:
Ylämaa area, Lappeenranta, South Karelia, Finland