Here is a list of eleven most important igneous rocks: 1. Granites 2. Diorite 3. Andesite 4. Syenites 5. Gabbro 6. Dolerites 7. Basalts 8. Pegmatites 9. Aplites 10. Lamprophyres 11. Peridotites. 1. Granites: Granites may be defined as plutonic light coloured igneous rocks. These are among the most common igneous rocks. The word granite is derived from Latin word [...]
In this article we will discuss about the texture and classification of igneous rocks. Texture of Igneous Rocks: Factors Explaining Texture of Igneous Rocks: The following three factors will primarily define the type of texture in a given igneous rock: (a) Degree of Crystallization: In an igneous rock, all the constituent minerals may be present in distinctly crystallized forms and [...]
The igneous rocks are more commonly classified on the basis of the mode of occurrence into two major groups:- 1. Intrusive Igneous Rocks 2. Extrusive Igneous Rocks. Group # 1. Intrusive Igneous Rocks: When the rising magmas during a volcanic activity do not reach the earth's surface rather they are cooled and solidfied below the surface of the earth, the [...]