Tonalite and Gneiss Definition

Definition of Tonalite and Gneiss

The general Tonalite and Gneiss definition can be stated as: Tonalite is a coarse-grained plutonic rock consisting mainly of sodic plagioclase, quartz, and hornblende or other mafic minerals with phaneritic texture. 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 Tonalite and Gneiss, get to know about Properties of Tonalite and Gneiss. Get to know more information about Tonalite and Gneiss origin and discoverer, etymology and class.

History of Tonalite and Gneiss

The history of Tonalite 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.

Tonalite and Gneiss Origin and Discoverer

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

Etymology of Tonalite and Gneiss

Along with Tonalite and Gneiss definition, know more about the etymology of Tonalite and Gneiss. Etymology of Tonalite and Gneiss gives information about origin and formation of a particular rock. Know more about Formation of Tonalite and Formation of Gneiss. The etymology of Tonalite is From Tonale Pass, northern Italy, + -ite1 while that of Gneiss is From Tonale Pass, northern Italy, + -ite1. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Tonalite belongs to Igneous Rocks while Gneiss belongs to Metamorphic Rocks. The sub-class, group and other categories of Tonalite and Gneiss are listed below.

For Tonalite,

• 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