Kersantite
A rock classification type
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About Kersantite
Name:
Defined by Delesse in 1851; named for the village of Kersanton, France.
A lamprophyre with plagioclase > K-feldspar and biotite as the dominant mafic mineral; no feldspathoid. A lamprophyre containing biotite and plagioclase (usually oligoclase or andesine), with or without clinopyroxene and olivine.
Unique Identifiers
Mindat ID:
48066
Long-form identifier:
mindat:1:1:48066:4
Classification of Kersantite
Sub-divisions of Kersantite
- Kersantite
Mineralogy of Kersantite
Essential minerals - these are minerals that are required within the classification of this rock:
| 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 |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole | (Na, K, ◻)(Ca,Na)2(Mg,Fe,Al)5((Si,Al)8O22)(OH,F,Cl,O)2 |
| Feldspar > Alkali Feldspar > K Feldspar | Potassium-dominant feldspars with variable crystal symmetry and Al-Si ordering state; they are a subgroup of ... |
| Mica | A petrological term for Mica Group. |
Internet Links for Kersantite
mindat.org URL:
https://www.mindat.org/min-48066.html
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Kerzanton, Loperhet, Brest, Finistère, Brittany, France