Trondhjemite and Obsidian Definition

Definition of Trondhjemite and Obsidian

The general Trondhjemite and Obsidian 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, Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth. Along with definition of Trondhjemite and Obsidian, get to know about Properties of Trondhjemite and Obsidian. Get to know more information about Trondhjemite and Obsidian origin and discoverer, etymology and class.

History of Trondhjemite and Obsidian

The history of Trondhjemite and Obsidian 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 Obsidian Origin and Discoverer

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

Etymology of Trondhjemite and Obsidian

Along with Trondhjemite and Obsidian definition, know more about the etymology of Trondhjemite and Obsidian. Etymology of Trondhjemite and Obsidian gives information about origin and formation of a particular rock. Know more about Formation of Trondhjemite and Formation of Obsidian. The etymology of Trondhjemite is From Trondheim, Norway while that of Obsidian is From Trondheim, Norway. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Trondhjemite and Obsidian belong to Igneous Rocks. The sub-class, group and other categories of Trondhjemite and Obsidian 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 Obsidian,

• Sub-class: Durable Rock and Medium Hardness Rock
• Group: Volcanic
• Other Categories: Opaque rock