Phonolite and Variolite Definition

Definition of Phonolite and Variolite

The general Phonolite and Variolite 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, Variolites are a group of dark green basic igneous rocks which exhibit pale colored spots, or spherules, especially on weathered surfaces, that give them a pockmarked appearance. Along with definition of Phonolite and Variolite, get to know about Properties of Phonolite and Variolite. Get to know more information about Phonolite and Variolite origin and discoverer, etymology and class.

History of Phonolite and Variolite

The history of Phonolite and Variolite 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 Variolite Origin and Discoverer

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

Etymology of Phonolite and Variolite

Along with Phonolite and Variolite definition, know more about the etymology of Phonolite and Variolite. Etymology of Phonolite and Variolite gives information about origin and formation of a particular rock. Know more about Formation of Phonolite and Formation of Variolite. 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 Variolite 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 and Variolite belong to Igneous Rocks. The sub-class, group and other categories of Phonolite and Variolite are listed below.

For Phonolite,

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

For Variolite,

• Sub-class: Durable Rock and Hard Rock
• Group: Volcanic
• Other Categories: Opaque rock