Obsidian and Nepheline Syenite Definition

Definition of Obsidian and Nepheline Syenite

The general Obsidian and Nepheline Syenite 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, Nepheline Syenite is a holocrystalline plutonic rock resembling syenite but containing nepheline and lacking quartz. Along with definition of Obsidian and Nepheline Syenite, get to know about Properties of Obsidian and Nepheline Syenite. Get to know more information about Obsidian and Nepheline Syenite origin and discoverer, etymology and class.

History of Obsidian and Nepheline Syenite

The history of Obsidian and Nepheline Syenite 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 Nepheline Syenite Origin and Discoverer

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

Etymology of Obsidian and Nepheline Syenite

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

For Obsidian,

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

For Nepheline Syenite,

• Sub-class: Durable Rock and Medium Hardness Rock
• Group: Plutonic
• Other Categories: Fine grained rock and Opaque rock