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Gneiss Rock
Gneiss rock is easy to
recognize.
It is a high-grade regional metamorphic rock with distinctive bands of minerals with different colours and sizes.
These rocks are folded even though the folds can sometimes be too large to see in a rock.
Like many metamorphic rocks they are foliated. They are, however, crystalline and not "schisty" - they do not break along layers as schists and some other metamorphics do.
The main minerals are quartz and feldspar. Others include mica, garnet, hornblende and staurolite.
By Rubem Porto Jr via Flickr.com
Depending the mineralogy these rocks may have different colours such as gray, pink or others.
By Richard Droker via Flickr.com
They often also have different names such as folded, biotite, or augen gneiss, depending on their texture or minerals.
By sparty lea via Flickr.com
They are medium to coarse grained.
By Mike Beauregard via Flickr.com
They are formed at very high temperatures and pressures from rock such as siltstone, mudstone, shale and granitoids. They are used in building and pottery.
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