Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Quartz-alkali-feldspar-syenite

A rock classification type
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An alkali-feldspar-syenite with 5-20% quartz on the QAPF diagram, and no foids


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Unique IdentifiersHide

Mindat ID:
48205
Long-form identifier:
mindat:1:1:48205:1

Classification of Quartz-alkali-feldspar-syeniteHide

QAPF_P_6star.png

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

Sub-divisions of Quartz-alkali-feldspar-syeniteHide

Mineralogy of Quartz-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 > 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

Internet Links for Quartz-alkali-feldspar-syeniteHide

References for Quartz-alkali-feldspar-syeniteHide

Reference List:
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