Obsidian and Chalk Definition

Definition of Obsidian and Chalk

The general Obsidian and Chalk 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, Chalk is a soft, white, powdery limestone consisting mainly of fossil shells of foraminifers. Along with definition of Obsidian and Chalk, get to know about Properties of Obsidian and Chalk. Get to know more information about Obsidian and Chalk origin and discoverer, etymology and class.

History of Obsidian and Chalk

The history of Obsidian and Chalk 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 Chalk Origin and Discoverer

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

Etymology of Obsidian and Chalk

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

For Obsidian,

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

For Chalk,

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