Gneiss and Lignite Definition

Definition of Gneiss and Lignite

The general Gneiss and Lignite 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, Lignite is a soft brownish coal which shows traces of plants and is intermediate between bituminous coal and peat. Along with definition of Gneiss and Lignite, get to know about Properties of Gneiss and Lignite. Get to know more information about Gneiss and Lignite origin and discoverer, etymology and class.

History of Gneiss and Lignite

The history of Gneiss and Lignite 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 Lignite Origin and Discoverer

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

Etymology of Gneiss and Lignite

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

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