Anthracite and Obsidian Definition

Definition of Anthracite and Obsidian

The general Anthracite and Obsidian definition can be stated as: Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster. 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 Anthracite and Obsidian, get to know about Properties of Anthracite and Obsidian. Get to know more information about Anthracite and Obsidian origin and discoverer, etymology and class.

History of Anthracite and Obsidian

The history of Anthracite 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.

Anthracite and Obsidian Origin and Discoverer

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

Etymology of Anthracite and Obsidian

Along with Anthracite and Obsidian definition, know more about the etymology of Anthracite and Obsidian. Etymology of Anthracite and Obsidian gives information about origin and formation of a particular rock. Know more about Formation of Anthracite and Formation of Obsidian. The etymology of Anthracite is From Greek anthrakites, from anthrax, anthrak meaning coal while that of Obsidian is From Greek anthrakites, from anthrax, anthrak meaning coal. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Anthracite belongs to Metamorphic Rocks while Obsidian belongs to Igneous Rocks. The sub-class, group and other categories of Anthracite and Obsidian are listed below.

For Anthracite,

• Sub-class: Durable Rock and Soft Rock
• Group: Not applicable
• Other Categories: Coarse grained rock, Fine grained rock, Medium grained rock and Opaque rock

For Obsidian,

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