Alkali feldspar granite
Type of igneous rock rich in alkali feldspar / From Wikipedia, the free encyclopedia
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Alkali feldspar granite, some varieties of which are called 'red granite',[1] is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar (K-spar). It is a dense rock with a phaneritic texture. The abundance of K-spar gives the rock a predominant pink to reddish hue; peppered with minor amounts of black minerals.[2][3]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/7/77/Qapf_diagram_plutonic_05.svg/640px-Qapf_diagram_plutonic_05.svg.png)
Quick Facts Composition, Primary ...
Igneous rock | |
Alkali feldspar granite. Holocrystalline texture, coarse-grained. Great amounts of potassium feldspar (orthoclase, pink-reddish in colour) | |
Composition | |
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Primary | Potassium feldspar, quartz |
Secondary | Plagioclase; dark minerals |
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