Gneiss and Phonolite Definition

Definition of Gneiss and Phonolite

The general Gneiss and Phonolite 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, Phonolite is an uncommon extrusive igneous rock volcanic rock of intermediate chemical composition between felsic and mafic. Along with definition of Gneiss and Phonolite, get to know about Properties of Gneiss and Phonolite. Get to know more information about Gneiss and Phonolite origin and discoverer, etymology and class.

History of Gneiss and Phonolite

The history of Gneiss and Phonolite 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 Phonolite Origin and Discoverer

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

Etymology of Gneiss and Phonolite

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

• Sub-class: Durable Rock and Medium Hardness Rock
• Group: Not applicable
• Other Categories: Fine grained rock and Opaque rock