What is the mineral composition of gneiss?
What is the mineral composition of gneiss? Gneiss is a coarse to medium grained banded metamorphic rock formed from igneous or sedimentary rocks during regional metamorphism. Rich in feldspars and quartz, gneisses also contain mica minerals and aluminous or ferromagnesian silicates. What type of metamorphic rock is formed from bituminous coal? anthracite Summary Chart of Common Metamorphic RocksOriginal RocksMetamorphic EquivalentFoliated?granitegneissyesbasaltschistyesbituminous coalanthracite coalno What 6 minerals are in gneiss? Composition and Texture of Gneiss Some specimens of gneiss contain distinctive minerals characteristic of the metamorphic environment. These minerals might include biotite, cordierite, sillimanite, kyanite, staurolite, andalusite, and garnet. What is the...