Granite, a type of igneous rock (Rocks formed from cooling magma or lava)
from: http://geology.com/rocks/granite.shtml
Sandstone, a type of sedimentary rock (Rocks that are formed by a buildup of sediment)
from: http://www.minimegeology.com/blog/2011/10/19/what-would-you-do-with-a-sandstone-rock/
Slate, a type of metamorphic rock (Rocks that are formed by other types of rocks changing over time)
from: https://en.wikipedia.org/wiki/Slate
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