Gneiss and Rapakivi Granite Definition

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.

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.

For Gneiss,

• Sub-class: Durable Rock and Hard Rock
• Group: Not applicable
• Other Categories: Coarse grained rock, Medium grained rock and Opaque rock

For Rapakivi Granite,

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