The two main types of Igneous rock are intrusive and extrusive rock. For intrusive rock, granite and gabbro are some examples and for extrusive rock, its andesite and basalt. The two main types of Metamorphic rocks are foliated and non-foliated rocks. For Foliated rock, gneiss and phyllite are some examples and for non-foliated rocks, its marble and quartzite. The two main types of Sedimentary rock are oragnic sedimentary rock, clastic sedimentary rock and chemical sedimentary rock. For organic sedimentary rock, its coal and some limestones which form from the accumulation of plant or animal debris, for clastic sedimentary rock, its sandstone and shale and for chemical sedimentary rock, rock salt and some limestone.
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