Porphyry and Chalk Definition

Definition of Porphyry and Chalk

The general Porphyry and Chalk 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, Chalk is a soft, white, powdery limestone consisting mainly of fossil shells of foraminifers. Along with definition of Porphyry and Chalk, get to know about Properties of Porphyry and Chalk. Get to know more information about Porphyry and Chalk origin and discoverer, etymology and class.

History of Porphyry and Chalk

The history of Porphyry and Chalk 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 Chalk Origin and Discoverer

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

Etymology of Porphyry and Chalk

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

For Porphyry,

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

For Chalk,

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