Pegmatite and Obsidian Definition

Definition of Pegmatite and Obsidian

The general Pegmatite and Obsidian definition can be stated as: Pegmatite rock is a holocrystalline, intrusive igneous rock which is composed of interlocking phaneritic crystals. 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 Pegmatite and Obsidian, get to know about Properties of Pegmatite and Obsidian. Get to know more information about Pegmatite and Obsidian origin and discoverer, etymology and class.

History of Pegmatite and Obsidian

The history of Pegmatite 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.

Pegmatite and Obsidian Origin and Discoverer

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

Etymology of Pegmatite and Obsidian

Along with Pegmatite and Obsidian definition, know more about the etymology of Pegmatite and Obsidian. Etymology of Pegmatite and Obsidian gives information about origin and formation of a particular rock. Know more about Formation of Pegmatite and Formation of Obsidian. The etymology of Pegmatite is From Greek pegma, pegmat which means- thing joined together + -ite while that of Obsidian is From Greek pegma, pegmat which means- thing joined together + -ite. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Pegmatite and Obsidian belong to Igneous Rocks. The sub-class, group and other categories of Pegmatite and Obsidian are listed below.

For Pegmatite,

• Sub-class: Durable Rock and Hard Rock
• Group: Plutonic
• Other Categories: Coarse grained rock and Opaque rock

For Obsidian,

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