Chalk and Obsidian Definition

Definition of Chalk and Obsidian

The general Chalk and Obsidian definition can be stated as: Chalk is a soft, white, powdery limestone consisting mainly of fossil shells of foraminifers. On the other hand, 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. Along with definition of Chalk and Obsidian, get to know about Properties of Chalk and Obsidian. Get to know more information about Chalk and Obsidian origin and discoverer, etymology and class.

History of Chalk and Obsidian

The history of Chalk and Obsidian 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.

Chalk and Obsidian Origin and Discoverer

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

Etymology of Chalk and Obsidian

Along with Chalk and Obsidian definition, know more about the etymology of Chalk and Obsidian. Etymology of Chalk and Obsidian gives information about origin and formation of a particular rock. Know more about Formation of Chalk and Formation of Obsidian. The etymology of Chalk is From old English cealc chalk, lime, plaster; pebble, from Greek khalix small pebble, in English transferred to the opaque, white, soft limestone while that of Obsidian is From old English cealc chalk, lime, plaster; pebble, from Greek khalix small pebble, in English transferred to the opaque, white, soft limestone. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Chalk belongs to Sedimentary Rocks while Obsidian belongs to Igneous Rocks. The sub-class, group and other categories of Chalk and Obsidian are listed below.

For Chalk,

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

For Obsidian,

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