Phonolite and Trondhjemite Definition

Definition of Phonolite and Trondhjemite

The general Phonolite and Trondhjemite definition can be stated as: Phonolite is an uncommon extrusive igneous rock volcanic rock of intermediate chemical composition between felsic and mafic. 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 Phonolite and Trondhjemite, get to know about Properties of Phonolite and Trondhjemite. Get to know more information about Phonolite and Trondhjemite origin and discoverer, etymology and class.

History of Phonolite and Trondhjemite

The history of Phonolite 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.

Phonolite and Trondhjemite Origin and Discoverer

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

Etymology of Phonolite and Trondhjemite

Along with Phonolite and Trondhjemite definition, know more about the etymology of Phonolite and Trondhjemite. Etymology of Phonolite and Trondhjemite gives information about origin and formation of a particular rock. Know more about Formation of Phonolite and Formation of Trondhjemite. The etymology of Phonolite is From the Greek meaning sounding stone because of the metallic sound it produces if an unfractured plate is hit while that of Trondhjemite is From the Greek meaning sounding stone because of the metallic sound it produces if an unfractured plate is hit. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Phonolite and Trondhjemite belong to Igneous Rocks. The sub-class, group and other categories of Phonolite and Trondhjemite are listed below.

For Phonolite,

• Sub-class: Durable Rock and Medium Hardness Rock
• Group: Not applicable
• Other Categories: Fine 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