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Essexite  and Obsidian Definition


Obsidian and Essexite  Definition


Definition

Definition
Essexite which is also known as nepheline monzogabbro, is a dark gray or black holocrystalline plutonic Iigneous Rock   
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   

History
  
  

Origin
USA   
Ethiopia   

Discoverer
Unknown   
Obsius   

Etymology
From the locality in Essex County, Massachusetts,US   
From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius   

Class
Igneous Rocks   
Igneous Rocks   

Sub-Class
Durable Rock, Hard Rock   
Durable Rock, Medium Hardness Rock   

Family
  
  

Group
Plutonic   
Volcanic   

Other Categories
Fine Grained Rock, Opaque Rock   
Opaque Rock   

Texture >>
<< Summary

Definition of Essexite  and Obsidian

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

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History of Essexite  and Obsidian

The history of Essexite  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.

Essexite  and Obsidian Origin and Discoverer

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

Etymology of Essexite  and Obsidian

Along with Essexite  and Obsidian definition, know more about the etymology of Essexite  and Obsidian. Etymology of Essexite  and Obsidian gives information about origin and formation of a particular rock. Know more about Formation of Essexite  and Formation of Obsidian. The etymology of Essexite  is From the locality in Essex County, Massachusetts,US while that of Obsidian is From the locality in Essex County, Massachusetts,US. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Essexite  and Obsidian belong to Igneous Rocks. The sub-class, group and other categories of Essexite  and Obsidian are listed below.

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