Types of Rocks and Classifications – चट्टानों के प्रकार एवं वर्गीकरण

Rocks are made up of individual substances, called minerals, found mostly in solid state. Rocks are classified into three major types. Three Types of Rock are

• Igneous rocks are formed by the solidification of the molten magma, e.g., Mica, Granite etc.
• Sedimentary rocks are formed due to accumulation of rock particles and organic matter in layers, under tremendous pressure, e.g., Gravel, Peat, Gypsum etc.
• Metamorphic rocks were originally igneous or sedimentary but late changed due to pressure, heat or action of water, e.g., Gneiss, Marble, Quartzite etc.

S. No	Types of Rocks	Original Rock	Metamorphic
1.	Igneous	Granite	Gneiss
2.	Igneous	Basait	Green-stone
3.	Sedimentary	Limestone	Marble
4.	Sedimentary	Coal	Graphite, Coal
5.	Sedimentary	Sandstone	Quartzite
6.	Sedimentary	Shale/Clay	Slate, Mica, Schist

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