Difference between Igneous rocks, sedimentary rocks and metamorphic rocks

B.Sc.Ag. (Hons) Part-I

Difference between Igneous rocks, sedimentary rocks and metamorphic rocks. https://cststudy.blogspot.com

Igneous rocks	Sedimentary rocks	Metamorphic rocks
1. Formed by solidification of molten magma on cooling.	1. Formed by consolidation of sediments.	1. Formed by subsequent transformation igneous and sedimentary rocks.
2. It may be called primary rocks because it formed first.	2. It is derived from breaking down of primary rocks.	2. It is derived from breaking down of primary and secondary rocks.
3. Igneous rocks consist mainly of primary minerals of which quartz, feldspar's, amphiboles, pyroxenes and mica are the most common.	3. Sedimentary rocks consist mainly of secondary minerals together with some qualities of primary minerals, such as: limestone, sandstone, siltstone, shale, calcareous sandstone, arenaceous limestone etc.	3. Metamorphic rocks consist of mainly granite, shales, limestone, sandstone etc.
4. No action of water, glacier and wind is taken place.	4. The action of water, glacier and wind is taken place.	4. Influenced by heat, pressure and gasses.
5. They have no layer so they called unstratified rocks.	5. They have layer so they called stratified rocks.	5. They may be layered or no layered.
6. These rocks are often shiny and glossy.	6. These rocks are soft looking and can contain fossils.	6. These rocks are hard and often contain crystals.
7. Example: Granite, gabbro, basalt etc.	7. Example: Sandstone, siltstone, shale etc.	7. Example: Marble, slate, gneiss, quartzite etc.

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