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Obsidian and Gneiss Definition


Gneiss and Obsidian Definition


Definition

Definition
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   
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   

History
  
  

Origin
Ethiopia   
Unknown   

Discoverer
Obsius   
Unknown   

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

Class
Igneous Rocks   
Metamorphic Rocks   

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

Family
  
  

Group
Volcanic   
Not Applicable   

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

Texture >>
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Definition of Obsidian and Gneiss

The general Obsidian and Gneiss 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, 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. Along with definition of Obsidian and Gneiss, get to know about Properties of Obsidian and Gneiss. Get to know more information about Obsidian and Gneiss origin and discoverer, etymology and class.

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History of Obsidian and Gneiss

The history of Obsidian and Gneiss 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 Gneiss Origin and Discoverer

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

Etymology of Obsidian and Gneiss

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

For Obsidian,

For Gneiss,

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