Home

Igneous Rocks + -

Fossil Rocks + -

Metamorphic Rocks + -

Durable Rocks + -

Medium Grained Rocks + -

Compare Rocks


Gneiss and Obsidian Definition


Obsidian and Gneiss Definition


Definition

Definition
Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks   
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
Unknown   
Ethiopia   

Discoverer
Unknown   
Obsius   

Etymology
From the Middle High German verb gneist (to spark; so called because the rock glitters)   
From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius   

Class
Metamorphic Rocks   
Igneous Rocks   

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

Family
  
  

Group
Not Applicable   
Volcanic   

Other Categories
Coarse Grained Rock, Medium Grained Rock, Opaque Rock   
Opaque Rock   

Texture >>
<< Summary

Definition of Gneiss and Obsidian

The general Gneiss and Obsidian definition can be stated as: Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks. 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 Gneiss and Obsidian, get to know about Properties of Gneiss and Obsidian. Get to know more information about Gneiss and Obsidian origin and discoverer, etymology and class.

Compare Metamorphic Rocks

History of Gneiss and Obsidian

The history of Gneiss 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.

Gneiss and Obsidian Origin and Discoverer

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

Etymology of Gneiss and Obsidian

Along with Gneiss and Obsidian definition, know more about the etymology of Gneiss and Obsidian. Etymology of Gneiss and Obsidian gives information about origin and formation of a particular rock. Know more about Formation of Gneiss and Formation of Obsidian. The etymology of Gneiss is From the Middle High German verb gneist (to spark; so called because the rock glitters) while that of Obsidian is From the Middle High German verb gneist (to spark; so called because the rock glitters). The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Gneiss belongs to Metamorphic Rocks while Obsidian belongs to Igneous Rocks. The sub-class, group and other categories of Gneiss and Obsidian are listed below.

For Gneiss,

For Obsidian,

Metamorphic Rocks

Metamorphic Rocks

» More Metamorphic Rocks

Compare Metamorphic Rocks

» More Compare Metamorphic Rocks