Gneiss and Adakite Definition

Definition of Gneiss and Adakite

The general Gneiss and Adakite 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, Adakite is an intermediate to felsic volcanic rock that has geochemical characteristics of magma which is said to be formed by partial melting of altered basalt that is subducted below volcanic arcs. Along with definition of Gneiss and Adakite, get to know about Properties of Gneiss and Adakite. Get to know more information about Gneiss and Adakite origin and discoverer, etymology and class.

History of Gneiss and Adakite

The history of Gneiss and Adakite 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 Adakite Origin and Discoverer

Gneiss and Adakite definition gives us a brief idea about the two rocks. In some cases, the definition also gives summary about the Formation of Gneiss and Adakite. In this section, you will know about Gneiss and Adakite Origin and Discoverer. Origin of Gneiss is Unknown whereas Origin of Adakite is Adak, Aleutian Islands. It is interesting to know the name of Gneiss and Adakite discoverer. The Discoverer of Gneiss is Unknown and the discoverer of Adakite is Defant and Drummond.

Etymology of Gneiss and Adakite

Along with Gneiss and Adakite definition, know more about the etymology of Gneiss and Adakite. Etymology of Gneiss and Adakite gives information about origin and formation of a particular rock. Know more about Formation of Gneiss and Formation of Adakite. The etymology of Gneiss is From the Middle High German verb gneist (to spark; so called because the rock glitters) while that of Adakite 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 Adakite belongs to Igneous Rocks. The sub-class, group and other categories of Gneiss and Adakite 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 Adakite,

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