Phonolite and Gneiss Definition

Definition of Phonolite and Gneiss

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

History of Phonolite and Gneiss

The history of Phonolite 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.

Phonolite and Gneiss Origin and Discoverer

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

Etymology of Phonolite and Gneiss

Along with Phonolite and Gneiss definition, know more about the etymology of Phonolite and Gneiss. Etymology of Phonolite and Gneiss gives information about origin and formation of a particular rock. Know more about Formation of Phonolite and Formation of Gneiss. The etymology of Phonolite is From the Greek meaning sounding stone because of the metallic sound it produces if an unfractured plate is hit while that of Gneiss is From the Greek meaning sounding stone because of the metallic sound it produces if an unfractured plate is hit. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Phonolite belongs to Igneous Rocks while Gneiss belongs to Metamorphic Rocks. The sub-class, group and other categories of Phonolite and Gneiss are listed below.

For Phonolite,

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

For Gneiss,

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