Gneiss and Andesite Definition

Definition of Gneiss and Andesite

The general Gneiss and Andesite definition can be stated as: Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks. On the other hand, Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava. Along with definition of Gneiss and Andesite, get to know about Properties of Gneiss and Andesite. Get to know more information about Gneiss and Andesite origin and discoverer, etymology and class.

History of Gneiss and Andesite

The history of Gneiss and Andesite gives information about where the rock was found and who was its discoverer. Almost each and every aspect of Earth's history is recorded in rocks be it the volcanoes which were erupted or the plants, animals and organisms which are now extinct, as rocks are present from millions of years.

Gneiss and Andesite Origin and Discoverer

Gneiss and Andesite definition gives us a brief idea about the two rocks. In some cases, the definition also gives summary about the Formation of Gneiss and Andesite. In this section, you will know about Gneiss and Andesite Origin and Discoverer. Origin of Gneiss is Unknown whereas Origin of Andesite is North America. It is interesting to know the name of Gneiss and Andesite discoverer. The discoverer of Gneiss and Andesite are Unknown.

Etymology of Gneiss and Andesite

Along with Gneiss and Andesite definition, know more about the etymology of Gneiss and Andesite. Etymology of Gneiss and Andesite gives information about origin and formation of a particular rock. Know more about Formation of Gneiss and Formation of Andesite. The etymology of Gneiss is From the Middle High German verb gneist (to spark; so called because the rock glitters) while that of Andesite is From the Middle High German verb gneist (to spark; so called because the rock glitters). The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Gneiss belongs to Metamorphic Rocks while Andesite belongs to Igneous Rocks. The sub-class, group and other categories of Gneiss and Andesite are listed below.

For Gneiss,

• Sub-class: Durable Rock and Hard Rock
• Group: Not applicable
• Other Categories: Coarse grained rock, Medium grained rock and Opaque rock

For Andesite,

• Sub-class: Durable Rock and Hard Rock
• Group: Volcanic
• Other Categories: Fine grained rock and Opaque rock