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This type of rock is also known as plutonic rock. Examples of extrusive igneous rocks include basalt, andesite, rhyolite, dacite, obsidian, pumice and scoria. Examples: Kaolin, Laterite, Slate etc. • A dolerite is the medium-grained equivalent of a basalt - a basic rock dominated by plagioclase and pyroxene. Argillaceous rocks are those which have clay or alumina as the main constituent. Calcareous rocks have calcium carbonate or lime as their leading constituent. Compared with basic rocks, acid rocks are of lighter colour and in coarsely crystalline varieties ; free silica or quartz can be seen without the use of a lens. Komatiite is a very rare and old extrusive igneous rock. If the intrusive rock cooled underground but near the surface, it is called subvolcanic or hypabyssal, and often has visible, but tiny mineral grains. However, if the bubbles are tiny, it’s called pumice. Usually contains one or more dark minerals, which may be mica, pyroxene, or amphibole. Granite is an acid rock. Our study shows that the mafic rock is superior to the granite in hosting a microbial community and to support formation of speleothems. An extrusive igneous rocks definition states these rocks form when magma "exits and cools above (or very near) the Earth's surface." Co Min. is that “dolerite” is a fine-grained basaltic rock and “granite” is a group of igneous and plutonic rocks composed primarily of feldspar and quartz. If the solidification of the rock occurs near to the earth surface, then the rocks obtained are known as volcanic rocks. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. These rocks possess extremely fine-grained structure. Granite and Dolerite are two examples of intrusive igneous rock. Granite is the best example of plutonic rock. Examples: Limestone and Marble. two types of host rock, Tjuv-Ante’s Cave represents a unique environment in which to study differences in microbe-rock interactions and speleothem genesis between the granite and dolerite host rock. In India there are abundant deposits of such rocks in areas like Raniganj, Rajasthan, Bihar, Madhya Pradesh, Tamil Nadu, Karnataka, Meghalaya and Assam. For instance, if an extrusive rock comes out as glass with large bubbles, it’s called scoria. • Introduction • Mineralogy • Textures • Classification of dolerite • Dolerite dyke • Formation of dolerite • Distribution • Uses • Conclusion 2. If they erupt from volcanoes onto the surface as lava, they are called extrusive rocks.By contrast, Intrusive rocks are formed from magma that cools underground. Co Range No. A rock mass can also fail in tension, compression or shear. Examples: Granite, Quartzite, Sandstone etc. Acid rocks: Igneous rocks containing over 65 per cent of silica. 1. These rocks are readily acted upon by even dilute HCl. These rocks include: andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff. Form excellent concrete aggregate. Fig 2: Igneous Rock – Granite ... Dolerite is an example of a hypabyssal rock. Examples of intrusive igneous rocks are: diabase, diorite, gabbro, granite, pegmatite, and peridotite. Granite Basalt Gneiss Schist Quart-zite Marble Lime-stone Sand-stone Shale Av. Granite has a lot of different colors ranging from white to pink. Co Max. Granite is quarried for building stone, road gravel, decorative stone, and tombstones. The difference between dolerite and granite. Igneous rocks are those that form via the process of melting and cooling. Granite, Dolerite, Basalt, Trap, are examples. Some cool so quickly that they form an amorphous glass. Is Granite an Intrusive or Extrusive Rock. If the bubbles are minimal, the rock is called obsidian.

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