Obsidian and Nephelinite Definition

Definition of Obsidian and Nephelinite

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

History of Obsidian and Nephelinite

The history of Obsidian and Nephelinite 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 Nephelinite Origin and Discoverer

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

Etymology of Obsidian and Nephelinite

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

For Obsidian,

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

For Nephelinite,

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