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 [...]
In this article we will discuss about the composition of igneous rocks and its landforms. Wide range of variations in the structure and composition of different types of igneous rocks largely controls the landscape characteristics of a given region. Basaltic plateaux and plains give birth to picturesque landscapes after continued weathering and erosion. Very deep and long gorges and canyons [...]