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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.

geology.com/rocks

Photographs and information for a large collection of igneous, metamorphic and sedimentary rocks. Geology.com

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

The three types of rocks. It’s the first thing you learn in a geology class — very briefly the three types of rocks are:. Igneous — they form from the cooling of magma deep inside the earth ...

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.neok12.com/Types-of-Rocks.htm

The three types of rocks are igneous, formed from molten rock, sedimentary, formed from the elements of an existing rock, and metamorphic, formed by a change in heat or pressure. Learn to identify the three different types of rocks in this lesson on rocks.

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. Examples of intrusive igneous rocks are diorite, gabbro, granite, pegmatite, and peridotite. Extrusive igneous rocks ...

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

Igneous rock, or magmatic rock, is one of the three main rock types. Igneous rock is formed by magma or lava cooling and solidifying. In either the mantle or crust of a planet, the magma can be derived from partial melts of existing rocks.

www.sandatlas.org/rock-types

Rock type is usually defined as a particular kind of rock having a specific set of characteristics 1. Rock types are specific assemblages of minerals (most rocks are composed of minerals). Rocks are much more vaguely defined than minerals. Even rocks within one rock type may have a highly variable composition.