Alkali feldspar granite
Alkali feldspar granite, some varieties of which are called 'red granite', 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.
| Igneous rock | |
Alkali feldspar granite. Holocrystalline texture, coarse-grained. Great amounts of potassium feldspar (orthoclase, pink-reddish in colour) | |
| Composition | |
|---|---|
| Primary | Potassium feldspar, quartz |
| Secondary | Plagioclase; dark minerals |
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