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Syenogranite

A rock classification type
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A granitoid (a coarse grained igneous rock composed of mostly quartz, plus Kspar (alkali-feldspar) and plagioclase), with plagioclase < Kspar. More specifically a granite having an alkali-feldspar/total feldspar ratio from 0.65-0.90, and 20-60% quartz on the QAPF diagram.


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Unique IdentifiersHide

Mindat ID:
50288
Long-form identifier:
mindat:1:1:50288:7

Classification of SyenograniteHide

QAPF_P_3a.png

Syenogranite is in section 3a of the QAPF diagram.

Sub-divisions of SyenograniteHide

Mineralogy of SyenograniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparA subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.
Feldspar > Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Silica > QuartzSiO2
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mica > MuscoviteKAl2(AlSi3O10)(OH)2

Synonyms of SyenograniteHide

Internet Links for SyenograniteHide

References for SyenograniteHide

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