Gneiss and Pegmatite Definition

Definition of Gneiss and Pegmatite

The general Gneiss and Pegmatite 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, Pegmatite rock is a holocrystalline, intrusive igneous rock which is composed of interlocking phaneritic crystals. Along with definition of Gneiss and Pegmatite, get to know about Properties of Gneiss and Pegmatite. Get to know more information about Gneiss and Pegmatite origin and discoverer, etymology and class.

History of Gneiss and Pegmatite

The history of Gneiss and Pegmatite 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 Pegmatite Origin and Discoverer

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

Etymology of Gneiss and Pegmatite

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

• Sub-class: Durable Rock and Hard Rock
• Group: Plutonic
• Other Categories: Coarse grained rock and Opaque rock