Provide a detailed rock description. Must include: - Modal minerology (e.g. 35%

Question

Provide a detailed rock description.

Must include:

- Modal minerology (e.g. 35% quartz, 25% plagioclast etc.),

- Detailed description (e.g. Sample X1 is a light-coloured rock, with pinkish K-feldspar crystals. The sample is coarse grained (grainsize range: 2-10 mm), phaneritic, and has a weakly porphyritic texture, with K-feldspar phenocrysts being larger than the other minerals on average. Plagioclase, K-feldspar and biotite exhibit subhedral microstructures, quartz is anhedral. The rock exhibits no obvious metamorphic fabrics (foliation is absent))

- other features

- A Rock name

Explanation / Answer

This rock name is Granite. It is a plutonic rock of which volcanic equivalent is rhyolite.It contains mostly felsic minerals such as quartz ,plagioclase and potash feldspar.It constitute the crust which is of composition ranges from granitic to grandodioritic.Subject to regional metamorphism granite gradually changes to gneiss ,whic w contains alternate bands darl and light minerals.

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