Trondhjemite and Gneiss Definition

Definition of Trondhjemite and Gneiss

The general Trondhjemite and Gneiss definition can be stated as: 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.. 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 Trondhjemite and Gneiss, get to know about Properties of Trondhjemite and Gneiss. Get to know more information about Trondhjemite and Gneiss origin and discoverer, etymology and class.

History of Trondhjemite and Gneiss

The history of Trondhjemite 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.

Trondhjemite and Gneiss Origin and Discoverer

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

Etymology of Trondhjemite and Gneiss

Along with Trondhjemite and Gneiss definition, know more about the etymology of Trondhjemite and Gneiss. Etymology of Trondhjemite and Gneiss gives information about origin and formation of a particular rock. Know more about Formation of Trondhjemite and Formation of Gneiss. The etymology of Trondhjemite is not available while that of Gneiss is not available. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Trondhjemite belongs to Igneous Rocks while Gneiss belongs to Metamorphic Rocks. The sub-class, group and other categories of Trondhjemite and Gneiss are listed below.

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

For Gneiss,

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