Shale and Obsidian Definition

Definition of Shale and Obsidian

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

History of Shale and Obsidian

The history of Shale 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.

Shale and Obsidian Origin and Discoverer

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

Etymology of Shale and Obsidian

Along with Shale and Obsidian definition, know more about the etymology of Shale and Obsidian. Etymology of Shale and Obsidian gives information about origin and formation of a particular rock. Know more about Formation of Shale and Formation of Obsidian. The etymology of Shale is From German Schalstein laminated limestone, and Schalgebirge layer of stone in stratified rock. From Old English scealu in its base sense of- thing that divides or separate, while that of Obsidian is From German Schalstein laminated limestone, and Schalgebirge layer of stone in stratified rock. From Old English scealu in its base sense of- thing that divides or separate,. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Shale belongs to Sedimentary Rocks while Obsidian belongs to Igneous Rocks. The sub-class, group and other categories of Shale and Obsidian are listed below.

For Shale,

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

For Obsidian,

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