1.1 Granite- is a common and widely occurring type of intrusive, felsic, igneous rock.
1.2 Basalt- is a common extrusive volcanic rock. It is usually gray to black and fine-grained due to rapid cooling of lava at the surface of a planet.
1.4 Diabase- a mafic, holocrystalline, igneous rock equivalent to volcanic basalt or plutonic gabbro.
2. Sedimentary Rocks
2.1 Sandstone- basically sand grains cemented together, which may have been deposited as sand dunes, sand bars, or washed into the sea.
3.3 Slate- a fine-grained, foliated, homogeneous, metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low grade regional metamorphism.
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