Obsidian and Ijolite Definition

Definition of Obsidian and Ijolite

The general Obsidian and Ijolite 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, Ijolite is an intrusive igneous rock which is composed mainly of nepheline and an alkali pyroxene, usually aegirine-augite. Along with definition of Obsidian and Ijolite, get to know about Properties of Obsidian and Ijolite. Get to know more information about Obsidian and Ijolite origin and discoverer, etymology and class.

History of Obsidian and Ijolite

The history of Obsidian and Ijolite 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 Ijolite Origin and Discoverer

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

Etymology of Obsidian and Ijolite

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

For Obsidian,

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

For Ijolite,

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