Argillaceous rocks are those which have clay or alumina as the main constituent. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Granite has a lot of different colors ranging from white to pink. Calcareous rocks have calcium carbonate or lime as their leading constituent. Co Max. Our study shows that the mafic rock is superior to the granite in hosting a microbial community and to support formation of speleothems. 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. These rocks are readily acted upon by even dilute HCl. Granite and Dolerite are two examples of intrusive igneous rock. Acid rocks: Igneous rocks containing over 65 per cent of silica. 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. Co Range No. Komatiite is a very rare and old extrusive igneous rock. These rocks possess extremely fine-grained structure. Examples of intrusive igneous rocks are: diabase, diorite, gabbro, granite, pegmatite, and peridotite. • Introduction • Mineralogy • Textures • Classification of dolerite • Dolerite dyke • Formation of dolerite • Distribution • Uses • Conclusion 2. An extrusive igneous rocks definition states these rocks form when magma "exits and cools above (or very near) the Earth's surface." In India there are abundant deposits of such rocks in areas like Raniganj, Rajasthan, Bihar, Madhya Pradesh, Tamil Nadu, Karnataka, Meghalaya and Assam. Examples: Limestone and Marble. A rock mass can also fail in tension, compression or shear. These rocks include: andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff. Granite is quarried for building stone, road gravel, decorative stone, and tombstones. Granite is the best example of plutonic rock. Is Granite an Intrusive or Extrusive Rock. Igneous rocks are those that form via the process of melting and cooling. Co Min. Granite Basalt Gneiss Schist Quart-zite Marble Lime-stone Sand-stone Shale Av. 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. If the bubbles are minimal, the rock is called obsidian. However, if the bubbles are tiny, it’s called pumice. Granite, Dolerite, Basalt, Trap, are examples. If the intrusive rock cooled underground but near the surface, it is called subvolcanic or hypabyssal, and often has visible, but tiny mineral grains. This type of rock is also known as plutonic rock. • A dolerite is the medium-grained equivalent of a basalt - a basic rock dominated by plagioclase and pyroxene. Form excellent concrete aggregate. Examples: Kaolin, Laterite, Slate etc. For instance, if an extrusive rock comes out as glass with large bubbles, it’s called scoria. Examples of extrusive igneous rocks include basalt, andesite, rhyolite, dacite, obsidian, pumice and scoria. 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. Usually contains one or more dark minerals, which may be mica, pyroxene, or amphibole. Granite is an acid rock. Examples: Granite, Quartzite, Sandstone etc. Some cool so quickly that they form an amorphous glass. 1. The difference between dolerite and granite. 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