Obsidian and Essexite  Definition

Definition of Obsidian and Essexite 

The general Obsidian and Essexite  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, Essexite which is also known as nepheline monzogabbro, is a dark gray or black holocrystalline plutonic Iigneous Rock. Along with definition of Obsidian and Essexite , get to know about Properties of Obsidian and Essexite . Get to know more information about Obsidian and Essexite  origin and discoverer, etymology and class.

History of Obsidian and Essexite 

The history of Obsidian and Essexite  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 Essexite  Origin and Discoverer

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

Etymology of Obsidian and Essexite 

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

For Obsidian,

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

For Essexite ,

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