Gneiss and Greywacke Definition

Definition of Gneiss and Greywacke

The general Gneiss and Greywacke 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, Greywacke is defined as a dark coarse-grained sandstone rock which contains more than 15 per cent clay. Along with definition of Gneiss and Greywacke, get to know about Properties of Gneiss and Greywacke. Get to know more information about Gneiss and Greywacke origin and discoverer, etymology and class.

History of Gneiss and Greywacke

The history of Gneiss and Greywacke 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 Greywacke Origin and Discoverer

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

Etymology of Gneiss and Greywacke

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

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