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In geology, rocks can be classified and identified as one of three different types: igneous, sedimentary or metamorphic, and the Rock Type Identification Key can be used to help you best determine which type a particular rock belongs to.

They are usually brown to gray in color and may have fossils and water or wind marks.The following 28 rocks are all considered igneous: Sedimentary rocks are born cool at the Earth's surface, mostly under water, and they usually consist of layers or strata; hence they are also called stratified rocks.The following list contains each commonly accepted type of sedimentary rock: Metamorphic rock formations occur when sedimentary and igneous rocks become changed, or metamorphosed, by conditions underground.Any good rockhound is bound to come across a rock that he or she has trouble identifying, especially if the location of where the rock was found is unknown.To identify a rock, think like a geologist and examine its physical characteristics for clues.