Argillite and Obsidian Definition

Definition of Argillite and Obsidian

The general Argillite and Obsidian definition can be stated as: Argillites are highly compact sedimentary or slightly metamorphosed rocks that consist largely or wholly of particles of clay or silt but lack the fissility of shale or the cleavage characteristic of slate. 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 Argillite and Obsidian, get to know about Properties of Argillite and Obsidian. Get to know more information about Argillite and Obsidian origin and discoverer, etymology and class.

History of Argillite and Obsidian

The history of Argillite 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.

Argillite and Obsidian Origin and Discoverer

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

Etymology of Argillite and Obsidian

Along with Argillite and Obsidian definition, know more about the etymology of Argillite and Obsidian. Etymology of Argillite and Obsidian gives information about origin and formation of a particular rock. Know more about Formation of Argillite and Formation of Obsidian. The etymology of Argillite is From Latin Argilla (clay) and -ite in English which became agrilla+ -ite = Argillite while that of Obsidian is From Latin Argilla (clay) and -ite in English which became agrilla+ -ite = Argillite. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Argillite belongs to Sedimentary Rocks while Obsidian belongs to Igneous Rocks. The sub-class, group and other categories of Argillite and Obsidian are listed below.

For Argillite,

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

For Obsidian,

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