Nephelinite and Obsidian Definition

Definition of Nephelinite and Obsidian

The general Nephelinite and Obsidian definition can be stated as: Nephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene (variety augite).. 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 Nephelinite and Obsidian, get to know about Properties of Nephelinite and Obsidian. Get to know more information about Nephelinite and Obsidian origin and discoverer, etymology and class.

History of Nephelinite and Obsidian

The history of Nephelinite 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.

Nephelinite and Obsidian Origin and Discoverer

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

Etymology of Nephelinite and Obsidian

Along with Nephelinite and Obsidian definition, know more about the etymology of Nephelinite and Obsidian. Etymology of Nephelinite and Obsidian gives information about origin and formation of a particular rock. Know more about Formation of Nephelinite and Formation of Obsidian. The etymology of Nephelinite is from French néphéline, from Greek nephelē while that of Obsidian is from French néphéline, from Greek nephelē. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Nephelinite and Obsidian belong to Igneous Rocks. The sub-class, group and other categories of Nephelinite and Obsidian are listed below.

For Nephelinite,

• Sub-class: Durable Rock and Hard Rock
• Group: Plutonic
• Other Categories: Fine grained rock and Opaque rock

For Obsidian,

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