Gneiss and Trondhjemite Definition

Definition of Gneiss and Trondhjemite

The general Gneiss and Trondhjemite 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, Trondhjemite is a leucocratic (light-colored) intrusive igneous rock. It is a variety of tonalite in which the plagioclase is mostly in the form of oligoclase. Trondhjemites are sometimes known as plagiogranites.. Along with definition of Gneiss and Trondhjemite, get to know about Properties of Gneiss and Trondhjemite. Get to know more information about Gneiss and Trondhjemite origin and discoverer, etymology and class.

History of Gneiss and Trondhjemite

The history of Gneiss and Trondhjemite 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 Trondhjemite Origin and Discoverer

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

Etymology of Gneiss and Trondhjemite

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

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