Coal and Gneiss Definition

Definition of Coal and Gneiss

The general Coal and Gneiss definition can be stated as: Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers called coal beds. On the other hand, 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. Along with definition of Coal and Gneiss, get to know about Properties of Coal and Gneiss. Get to know more information about Coal and Gneiss origin and discoverer, etymology and class.

History of Coal and Gneiss

The history of Coal and Gneiss 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.

Coal and Gneiss Origin and Discoverer

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

Etymology of Coal and Gneiss

Along with Coal and Gneiss definition, know more about the etymology of Coal and Gneiss. Etymology of Coal and Gneiss gives information about origin and formation of a particular rock. Know more about Formation of Coal and Formation of Gneiss. The etymology of Coal is From the Old English term col, which has meant mineral of fossilized carbon since the 13th century while that of Gneiss is From the Old English term col, which has meant mineral of fossilized carbon since the 13th century. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Coal belongs to Sedimentary Rocks while Gneiss belongs to Metamorphic Rocks. The sub-class, group and other categories of Coal and Gneiss are listed below.

For Coal,

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

For Gneiss,

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