Coal and Greywacke Definition

Definition of Coal and Greywacke

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

History of Coal and Greywacke

The history of Coal 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.

Coal and Greywacke Origin and Discoverer

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

Etymology of Coal and Greywacke

Along with Coal and Greywacke definition, know more about the etymology of Coal and Greywacke. Etymology of Coal and Greywacke gives information about origin and formation of a particular rock. Know more about Formation of Coal and Formation of Greywacke. 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 Greywacke 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 and Greywacke belong to Sedimentary Rocks. The sub-class, group and other categories of Coal and Greywacke 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 Greywacke,

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