Greywacke and Rapakivi Granite Definition

Definition of Greywacke and Rapakivi Granite

The general Greywacke and Rapakivi Granite definition can be stated as: Greywacke is defined as a dark coarse-grained sandstone rock which contains more than 15 per cent clay. On the other hand, Rapakivi Granite is a hornblende-biotite Granite containing large rounded crystals of orthoclase which are mantled with oligoclase. Along with definition of Greywacke and Rapakivi Granite, get to know about Properties of Greywacke and Rapakivi Granite. Get to know more information about Greywacke and Rapakivi Granite origin and discoverer, etymology and class.

History of Greywacke and Rapakivi Granite

The history of Greywacke and Rapakivi Granite 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.

Greywacke and Rapakivi Granite Origin and Discoverer

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

Etymology of Greywacke and Rapakivi Granite

Along with Greywacke and Rapakivi Granite definition, know more about the etymology of Greywacke and Rapakivi Granite. Etymology of Greywacke and Rapakivi Granite gives information about origin and formation of a particular rock. Know more about Formation of Greywacke and Formation of Rapakivi Granite. The etymology of Greywacke is From German Grauwacke, from grau grey + wacke while that of Rapakivi Granite is From German Grauwacke, from grau grey + wacke. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Greywacke belongs to Sedimentary Rocks while Rapakivi Granite belongs to Igneous Rocks. The sub-class, group and other categories of Greywacke and Rapakivi Granite are listed below.

For Greywacke,

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

For Rapakivi Granite,

• Sub-class: Durable Rock and Hard Rock
• Group: Plutonic
• Other Categories: Coarse grained rock and Opaque rock