Question

What is the texture and Mineralogy?

Gneiss (pronounced nice)

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Answer #1

Dear Student,

Gneiss is a very common and widely distributed metamorphic rock. Formations composed of igneous or sedimentary rocks undergo metamophism by high temperature and pressure to form gneiss.

Gneiss mostly show a banded texture characterised by alternating dark and light bands. The lighter band is composed of quartz and feldspar while the darker band contains biotite, hornblende, garnet or graphite.

It is medium to coarse grained.

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