Obsidian and Andesite Definition

Definition of Obsidian and Andesite

The general Obsidian and Andesite 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, Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava. Along with definition of Obsidian and Andesite, get to know about Properties of Obsidian and Andesite. Get to know more information about Obsidian and Andesite origin and discoverer, etymology and class.

History of Obsidian and Andesite

The history of Obsidian and Andesite 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 Andesite Origin and Discoverer

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

Etymology of Obsidian and Andesite

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

For Obsidian,

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

For Andesite,

• Sub-class: Durable Rock and Hard Rock
• Group: Volcanic
• Other Categories: Fine grained rock and Opaque rock