Gritstone and Obsidian Definition

Definition of Gritstone and Obsidian

The general Gritstone and Obsidian definition can be stated as: Gritstone or grit is a hard, coarse-grained, siliceous sandstone. 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 Gritstone and Obsidian, get to know about Properties of Gritstone and Obsidian. Get to know more information about Gritstone and Obsidian origin and discoverer, etymology and class.

History of Gritstone and Obsidian

The history of Gritstone 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.

Gritstone and Obsidian Origin and Discoverer

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

Etymology of Gritstone and Obsidian

Along with Gritstone and Obsidian definition, know more about the etymology of Gritstone and Obsidian. Etymology of Gritstone and Obsidian gives information about origin and formation of a particular rock. Know more about Formation of Gritstone and Formation of Obsidian. The etymology of Gritstone is From Grit + Stone while that of Obsidian is From Grit + Stone. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Gritstone belongs to Sedimentary Rocks while Obsidian belongs to Igneous Rocks. The sub-class, group and other categories of Gritstone and Obsidian are listed below.

For Gritstone,

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

For Obsidian,

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