Phonolite and Obsidian Definition

Definition of Phonolite and Obsidian

The general Phonolite and Obsidian 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, Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth. Along with definition of Phonolite and Obsidian, get to know about Properties of Phonolite and Obsidian. Get to know more information about Phonolite and Obsidian origin and discoverer, etymology and class.

History of Phonolite and Obsidian

The history of Phonolite and Obsidian 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 Obsidian Origin and Discoverer

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

Etymology of Phonolite and Obsidian

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

For Phonolite,

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

For Obsidian,

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