Gneiss and Variolite Definition

Definition of Gneiss and Variolite

The general Gneiss and Variolite definition can be stated as: Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks. On the other hand, Variolites are a group of dark green basic igneous rocks which exhibit pale colored spots, or spherules, especially on weathered surfaces, that give them a pockmarked appearance. Along with definition of Gneiss and Variolite, get to know about Properties of Gneiss and Variolite. Get to know more information about Gneiss and Variolite origin and discoverer, etymology and class.

History of Gneiss and Variolite

The history of Gneiss and Variolite 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.

Gneiss and Variolite Origin and Discoverer

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

Etymology of Gneiss and Variolite

Along with Gneiss and Variolite definition, know more about the etymology of Gneiss and Variolite. Etymology of Gneiss and Variolite gives information about origin and formation of a particular rock. Know more about Formation of Gneiss and Formation of Variolite. The etymology of Gneiss is From the Middle High German verb gneist (to spark; so called because the rock glitters) while that of Variolite is From the Middle High German verb gneist (to spark; so called because the rock glitters). The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Gneiss belongs to Metamorphic Rocks while Variolite belongs to Igneous Rocks. The sub-class, group and other categories of Gneiss and Variolite are listed below.

For Gneiss,

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

For Variolite,

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