Obsidian and Trondhjemite Definition

Definition of Obsidian and Trondhjemite

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

History of Obsidian and Trondhjemite

The history of Obsidian 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.

Obsidian and Trondhjemite Origin and Discoverer

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

Etymology of Obsidian and Trondhjemite

Along with Obsidian and Trondhjemite definition, know more about the etymology of Obsidian and Trondhjemite. Etymology of Obsidian and Trondhjemite gives information about origin and formation of a particular rock. Know more about Formation of Obsidian and Formation of Trondhjemite. The etymology of Obsidian is From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius while that of Trondhjemite is From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Obsidian and Trondhjemite belong to Igneous Rocks. The sub-class, group and other categories of Obsidian and Trondhjemite are listed below.

For Obsidian,

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