Obsidian and Shale Definition

Definition of Obsidian and Shale

The general Obsidian and Shale 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, Shale is a fine-grained sedimentary rock which is formed by the compaction of silt and clay-size mineral particles. Along with definition of Obsidian and Shale, get to know about Properties of Obsidian and Shale. Get to know more information about Obsidian and Shale origin and discoverer, etymology and class.

History of Obsidian and Shale

The history of Obsidian and Shale 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 Shale Origin and Discoverer

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

Etymology of Obsidian and Shale

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

For Obsidian,

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

For Shale,

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