Arkose and Obsidian Definition

Definition of Arkose and Obsidian

The general Arkose and Obsidian definition can be stated as: Arkose is a sedimentary rock, specifically a type of sandstone containing at least 25% feldspar. 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 Arkose and Obsidian, get to know about Properties of Arkose and Obsidian. Get to know more information about Arkose and Obsidian origin and discoverer, etymology and class.

History of Arkose and Obsidian

The history of Arkose 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.

Arkose and Obsidian Origin and Discoverer

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

Etymology of Arkose and Obsidian

Along with Arkose and Obsidian definition, know more about the etymology of Arkose and Obsidian. Etymology of Arkose and Obsidian gives information about origin and formation of a particular rock. Know more about Formation of Arkose and Formation of Obsidian. The etymology of Arkose is From Auvergne region of France used by a French geologist Alexandre Brongniart in 1826 who applied this term to some feldspathic sandstones while that of Obsidian is From Auvergne region of France used by a French geologist Alexandre Brongniart in 1826 who applied this term to some feldspathic sandstones. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Arkose belongs to Sedimentary Rocks while Obsidian belongs to Igneous Rocks. The sub-class, group and other categories of Arkose and Obsidian are listed below.

For Arkose,

• Sub-class: Durable Rock and Hard Rock
• Group: Not applicable
• Other Categories: Coarse grained rock and Opaque rock

For Obsidian,

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