Gneiss and Tephrite Definition

Definition of Gneiss and Tephrite

The general Gneiss and Tephrite 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, Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock. Along with definition of Gneiss and Tephrite, get to know about Properties of Gneiss and Tephrite. Get to know more information about Gneiss and Tephrite origin and discoverer, etymology and class.

History of Gneiss and Tephrite

The history of Gneiss and Tephrite 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 Tephrite Origin and Discoverer

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

Etymology of Gneiss and Tephrite

Along with Gneiss and Tephrite definition, know more about the etymology of Gneiss and Tephrite. Etymology of Gneiss and Tephrite gives information about origin and formation of a particular rock. Know more about Formation of Gneiss and Formation of Tephrite. The etymology of Gneiss is From the Middle High German verb gneist (to spark; so called because the rock glitters) while that of Tephrite 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 Tephrite belongs to Igneous Rocks. The sub-class, group and other categories of Gneiss and Tephrite 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 Tephrite,

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