Obsidian and Arkose Definition

Definition of Obsidian and Arkose

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

History of Obsidian and Arkose

The history of Obsidian and Arkose 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 Arkose Origin and Discoverer

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

Etymology of Obsidian and Arkose

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

For Obsidian,

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

For Arkose,

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