Obsidian and Amphibolite Definition

Definition of Obsidian and Amphibolite

The general Obsidian and Amphibolite 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, Amphibolite can be defined as a granular metamorphic rock which mainly consist of hornblende and plagioclase. Along with definition of Obsidian and Amphibolite, get to know about Properties of Obsidian and Amphibolite. Get to know more information about Obsidian and Amphibolite origin and discoverer, etymology and class.

History of Obsidian and Amphibolite

The history of Obsidian and Amphibolite 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 Amphibolite Origin and Discoverer

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

Etymology of Obsidian and Amphibolite

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

For Obsidian,

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

For Amphibolite,

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