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en.wikipedia.org/wiki/List_of_rock_types

The following is a list of rock types recognized by geologists.There is no agreed number of specific types of rocks. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe rock types.

www.zmescience.com/other/science-abc/types-of-rock

The types of rock: igneous, metamorphic and sedimentary. ... There are over 700 hundred types of igneous rocks, and they are generally the hardest and heavies t o f all rocks.

www.wisegeek.com/what-are-the-different-types-of-rocks.htm

There are three types of rocks: igneous, metamorphic, and sedimentary, in order of abundance.Within these classifications are many hundreds of types. The first two are formed under conditions of extreme heat and pressure.

www.learner.org/interactives/rockcycle/types.html

Types of Rocks Rocks are not all the same! The three main types, or classes, of rock are sedimentary, metamorphic, and igneous and the differences among them have to do with how they are formed. Sedimentary Sedimentary rocks are formed from particles of sand, shells, pebbles, and other fragments of material.

www.geologypage.com/2017/03/types-of-rocks.html

There are three basic types of sedimentary rocks: Clastic sedimentary rocks such as breccia, conglomerate, sandstone, siltstone, and shale are formed from mechanical weathering debris. Chemical sedimentary rocks such as rock salt, iron ore, chert, flint, some dolomites, and some limestones, form when dissolved materials precipitate from solution.

geology.com/rocks/igneous-rocks.shtml

Igneous rocks are formed from the solidification of molten rock material. There are two basic types. Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form.

jersey.uoregon.edu/~mstrick/AskGeoMan/geoQuerry13.html

Sedimentary rocks are called secondary, because they are often the result of the accumulation of small pieces broken off of pre-existing rocks. There are three main types of sedimentary rocks: Clastic: your basic sedimentary rock. Clastic sedimentary rocks are accumulations of clasts: little pieces of broken up rock which have piled up and been ...

www.nationalgeographic.com/science/earth/inside-the-earth/rocks

There are three basic types of rock: igneous, sedimentary, and metamorphic. Extremely common in the Earth's crust, igneous rocks are volcanic and form from molten material.

www.eartheclipse.com/geology/basic-types-of-rocks.html

The rocks may be made up entirely of one mineral or various minerals, and their sizes are determined by the cooling process. Igneous rocks are of two types, intrusive and extrusive. Intrusive igneous rocks are formed when the magma cools off slowly under the earth’s crust and hardens into rocks.

en.wikipedia.org/wiki/List_of_rock_genres

List of rock genres ... This is a list of rock music genres consisting of subgenres of popular music that have roots in 1940s' and 1950s' rock and roll, and which developed into a distinct identity as rock music in the 1960s, particularly in the United Kingdom and the United States.