Chalk and Porphyry Definition

Definition of Chalk and Porphyry

The general Chalk and Porphyry definition can be stated as: Chalk is a soft, white, powdery limestone consisting mainly of fossil shells of foraminifers. On the other hand, Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix. Along with definition of Chalk and Porphyry, get to know about Properties of Chalk and Porphyry. Get to know more information about Chalk and Porphyry origin and discoverer, etymology and class.

History of Chalk and Porphyry

The history of Chalk and Porphyry 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.

Chalk and Porphyry Origin and Discoverer

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

Etymology of Chalk and Porphyry

Along with Chalk and Porphyry definition, know more about the etymology of Chalk and Porphyry. Etymology of Chalk and Porphyry gives information about origin and formation of a particular rock. Know more about Formation of Chalk and Formation of Porphyry. The etymology of Chalk is From old English cealc chalk, lime, plaster; pebble, from Greek khalix small pebble, in English transferred to the opaque, white, soft limestone while that of Porphyry is From old English cealc chalk, lime, plaster; pebble, from Greek khalix small pebble, in English transferred to the opaque, white, soft limestone. The process of formation of rocks defines the class of rock. All the rocks in a class are formed by similar processes. Chalk belongs to Sedimentary Rocks while Porphyry belongs to Igneous Rocks. The sub-class, group and other categories of Chalk and Porphyry are listed below.

For Chalk,

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

For Porphyry,

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