A sedimentary rock formed of fine to coarse sand-sized grains that have been either compacted or cemented together. Although sandstone usually consists primarily of quartz, it can also consist of other minerals. Sandstone varies in color from yellow or red to gray or brown.
Adapted from "sandstone." (n.d.) The American Heritage® Dictionary of Student Science, Second Edition. (2014). Retrieved December 7 2015 from http://www.thefreedictionary.com/sandstone