Obsidian and Gneiss Definition

Definition of Obsidian and Gneiss

The general Obsidian and Gneiss 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, Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks. Along with definition of Obsidian and Gneiss, get to know about Properties of Obsidian and Gneiss. Get to know more information about Obsidian and Gneiss origin and discoverer, etymology and class.

History of Obsidian and Gneiss

The history of Obsidian and Gneiss 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 Gneiss Origin and Discoverer

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

Etymology of Obsidian and Gneiss

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

For Obsidian,

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

For Gneiss,

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