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Leucoquartz-alkali-feldspar-syenite

A rock subtype
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A quartz-alkali-feldspar-syenite with an M' colour index of less than 5.


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Unique IdentifiersHide

Mindat ID:
48206
Long-form identifier:
mindat:1:1:48206:0
GUID
(UUID V4):
d15fd70a-ccf1-4f2e-b31c-f08d84f35861

Classification of Leucoquartz-alkali-feldspar-syeniteHide

QAPF_P_6*.png

Quartz-alkali-feldspar-syenite is in section 6* of the QAPF diagram.

Mineralogy of Leucoquartz-alkali-feldspar-syeniteHide

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.
Silica > QuartzSiO2
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAn informal name for dark green to black amphiboles, mostly ferro-hornblende or ...
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2

References for Leucoquartz-alkali-feldspar-syeniteHide

Reference List:
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Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press

Internet Links for Leucoquartz-alkali-feldspar-syeniteHide

 
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