Porphyry and Coal Definition

Definition of Porphyry and Coal

The general Porphyry and Coal definition can be stated as: Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix. On the other hand, Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers called coal beds. Along with definition of Porphyry and Coal, get to know about Properties of Porphyry and Coal. Get to know more information about Porphyry and Coal origin and discoverer, etymology and class.

History of Porphyry and Coal

The history of Porphyry and Coal 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.

Porphyry and Coal Origin and Discoverer

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

Etymology of Porphyry and Coal

Along with Porphyry and Coal definition, know more about the etymology of Porphyry and Coal. Etymology of Porphyry and Coal gives information about origin and formation of a particular rock. Know more about Formation of Porphyry and Formation of Coal. The etymology of Porphyry is From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites while that of Coal is From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Porphyry belongs to Igneous Rocks while Coal belongs to Sedimentary Rocks. The sub-class, group and other categories of Porphyry and Coal are listed below.

For Porphyry,

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

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