Obsidian and Argillite Definition

Definition of Obsidian and Argillite

The general Obsidian and Argillite 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, 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. Along with definition of Obsidian and Argillite, get to know about Properties of Obsidian and Argillite. Get to know more information about Obsidian and Argillite origin and discoverer, etymology and class.

History of Obsidian and Argillite

The history of Obsidian and Argillite 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 Argillite Origin and Discoverer

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

Etymology of Obsidian and Argillite

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

For Obsidian,

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

For Argillite,

• Sub-class: Durable Rock and Soft Rock
• Group:
• Other Categories: Fine grained rock and Opaque rock