Igneous Rocks can be of two types extrusive and intrusive . Extrusive rocks come out from inside of the earth and cool down on the surface therefore has very less time for formation of crystals. As the gases stored inside the magma have no time to escape out they form voids inside the rock mass, later these voids are filled with secondary depositions forming amygdaliods and the rock thus formed is said to have a amygdaloidal structure.
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