Obsidian and Gritstone Definition

Definition of Obsidian and Gritstone

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

History of Obsidian and Gritstone

The history of Obsidian and Gritstone 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 Gritstone Origin and Discoverer

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

Etymology of Obsidian and Gritstone

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

For Obsidian,

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

For Gritstone,

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