Obsidian and Phonolite Definition

Definition of Obsidian and Phonolite

The general Obsidian and Phonolite definition can be stated as: 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. 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 Obsidian and Phonolite, get to know about Properties of Obsidian and Phonolite. Get to know more information about Obsidian and Phonolite origin and discoverer, etymology and class.

History of Obsidian and Phonolite

The history of Obsidian 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.

Obsidian and Phonolite Origin and Discoverer

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

Etymology of Obsidian and Phonolite

Along with Obsidian and Phonolite definition, know more about the etymology of Obsidian and Phonolite. Etymology of Obsidian and Phonolite gives information about origin and formation of a particular rock. Know more about Formation of Obsidian and Formation of Phonolite. The etymology of Obsidian is From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius while that of Phonolite is From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Obsidian and Phonolite belong to Igneous Rocks. The sub-class, group and other categories of Obsidian and Phonolite are listed below.

For Obsidian,

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

For Phonolite,

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