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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 ...

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

This type of rock is formed over long periods of time as tiny grains of material are pressed against each other and join loosely. The process by which sedimentary rocks are formed is delicate enough that fossils can be preserved within them. Common examples include sandstone, chalk, and limestone. Ad.

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.youtube.com/watch?v=CeuYx-AbZdo

Hey kids! What strikes your mind when you hear the word rock? Is that 'rock music?' Well not anymore, as Dr.Binocs is here to explain different types of rocks that exist around us. Tune into this ...