Pegmatite and Gneiss Definition

Definition of Pegmatite and Gneiss

The general Pegmatite and Gneiss definition can be stated as: Pegmatite rock is a holocrystalline, intrusive igneous rock which is composed of interlocking phaneritic crystals. On the other hand, 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. Along with definition of Pegmatite and Gneiss, get to know about Properties of Pegmatite and Gneiss. Get to know more information about Pegmatite and Gneiss origin and discoverer, etymology and class.

History of Pegmatite and Gneiss

The history of Pegmatite and Gneiss 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.

Pegmatite and Gneiss Origin and Discoverer

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

Etymology of Pegmatite and Gneiss

Along with Pegmatite and Gneiss definition, know more about the etymology of Pegmatite and Gneiss. Etymology of Pegmatite and Gneiss gives information about origin and formation of a particular rock. Know more about Formation of Pegmatite and Formation of Gneiss. The etymology of Pegmatite is From Greek pegma, pegmat which means- thing joined together + -ite while that of Gneiss is From Greek pegma, pegmat which means- thing joined together + -ite. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Pegmatite belongs to Igneous Rocks while Gneiss belongs to Metamorphic Rocks. The sub-class, group and other categories of Pegmatite and Gneiss are listed below.

For Pegmatite,

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

For Gneiss,

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