Obsidian and Pegmatite Definition

Definition of Obsidian and Pegmatite

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

History of Obsidian and Pegmatite

The history of Obsidian and Pegmatite 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 Pegmatite Origin and Discoverer

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

Etymology of Obsidian and Pegmatite

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

For Obsidian,

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

For Pegmatite,

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