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Gneiss and Rapakivi Granite Definition


Rapakivi Granite 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   
Rapakivi Granite is a hornblende-biotite Granite containing large rounded crystals of orthoclase which are mantled with oligoclase   

History
  
  

Origin
Unknown   
Finland, Europe   

Discoverer
Unknown   
Jakob Sederholm   

Etymology
From the Middle High German verb gneist (to spark; so called because the rock glitters)   
From Finnish Rapakivi which stands for crumbly rock   

Class
Metamorphic Rocks   
Igneous Rocks   

Sub-Class
Durable Rock, Hard Rock   
Durable Rock, Hard Rock   

Family
  
  

Group
Not Applicable   
Plutonic   

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

Texture >>
<< Summary

Definition of Gneiss and Rapakivi Granite

The general Gneiss and Rapakivi Granite 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, Rapakivi Granite is a hornblende-biotite Granite containing large rounded crystals of orthoclase which are mantled with oligoclase. Along with definition of Gneiss and Rapakivi Granite, get to know about Properties of Gneiss and Rapakivi Granite. Get to know more information about Gneiss and Rapakivi Granite origin and discoverer, etymology and class.

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History of Gneiss and Rapakivi Granite

The history of Gneiss and Rapakivi Granite 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 Rapakivi Granite Origin and Discoverer

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

Etymology of Gneiss and Rapakivi Granite

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

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