What is the gneiss?
Gneiss is a common type of surface rock composed of different minerals and is classified as metamorphic. This means that in the past it has undergone some change, often because of the heat or pressure that changed its structure without melting it in the process, which would then classify it as igneous. One of the most common features of Gneiss rock is that it has a striped or striped internal structure, which is usually the result of alternating layers of dark and light silicate compounds that are produced. Belts, such as alternating feldspar and quartz, can give a pink and white striped look. Hornebente is another common component, which is a dark green form of calcium, magnesium or iron, and often mixes with mica in a row of layers to give the rock green-gray or white banding.
Though metamorphic rock actually does not make it a relatively high temperature for different types of minerals,to separate into different layers. This occurs in the range of 1,112 ° to 1,292 ° Fahrenheit (600 ° to 700 ° C) and results in an internal mineral structure consisting of granular texture, which can be either a course or medium grain. If the minerals are sufficiently different and separated in a gneiss rock to a fine degree, it has a limited tendency to break along the lines of the individual layers.
The internal structure of Gneiss rocks can often have a slightly shimmering effect due to the presence of small crystals of the mica and quartz that catches and reflect light. The rock itself comes from a rock that was igneous or sedimentary before it was heated and reform, so it tends to carry some crystalline structures along with it. Some scientists believe that the origin of the name can be traced to an ancient German verb of the same spelling, which means "spark".
The most common form of rock tends to be composed of quartz and one of several types of feldspar because these minerals are inNature widely present. They create lighter versions of specimens, although many other mineral combinations, including minerals such as Pegamite, Biotite and Zircon are possible. Gneiss formation usually destroys any fossils that may have been present, but the presence of compounds, such as Zirconia silicate, can be used for geological dating. Gneiss Rock is considered a dominant form of rock in the lower crustal layers of the country and in certain places like Greenland. Carbon compounds in such rocks provide evidence of life that stretches back nearly 4,000,000,000,000 Lets.