Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account

Andesitic composition:

The composition of igneous rocks lying between felsic and mafic.

Basaltic Composition

A compositional group of igneous rock which indicates the rock contains substantial dark silicate minerals and calcium-rich plagioclase feldspar.

Bowen's reaction series

A concept proposed by N.L. Bowen that illustrates the relationship between magma and the minerals crystallizing from it during the formation of igneous rocks.

Chemical sedimentary rock

Sedimentary rock that is made up of material that was precipitated from water by either inorganic or organic means.

Coarse-grained texture

An igneous rock texture in which the crystals are roughly equal in size and large enough so that individual minerals can be identified with the unaided eye.

Contact metamorphism

Changes in rocks that are created by the heat from a nearby magma body.


The growth and formation of crystalline solid from a gas or liquid.

Disseminated deposit

Any economic mineral deposit in which the desired mineral occurs as scattered particles in the rock but in good amounts to make the deposit an ore.


A sedimentary rock produced from material deposited from solution by means of evaporation of the water.


Igneous activity that takes place outside the crust.


The group of igneous rocks that are composed of mainly feldspar and quartz.


A texture of metamorphic rocks that gives the rock a layered appearance.


The remains or traces of organisms that are preserved from the geologic past.


A term used to describe the specific texture of specific igneous rocks like obsidian, which contains no crystals.

Granitic composition

A compositional group of rocks, igneous, that indicate a rocks composition to be composed of mainly light-colored silicates.

Hydrothermal solution

The hot, watery solution that escapes from a mass of magma during the later stages of crystallization. Hydrothermal solutions, solutions may alter the surrounding country of rock and are typically the source of significant ore deposits.

Igneous rock

A rock formed by the crystallization of molten magma.


The process, usually cementation and/or compaction, of converting sediments to solid rock.


Igneous rocks with a low level of silica content and a high iron-magnesium content.


A body of molten rock found at depth, including any dissolved gases and crystals.

Metamorphic rock

Rocks formed by the alteration of preexisting rock deep within Earth, though still in a solid state, because of heat, pressure, and/or chemically active fluids.


The changes in mineral composition and texture of a rock subjected to high temperature and pressure within Earth.

Nonfoliated texture

The texture of rocks that do not exhibit foliation, or layered appearance.

Porphyritic texture

The texture of rocks consisting of large crystals embedded in a matrix of smaller crystals.

Regional metamorphism

Metamorphism associated with large-scale mountain-building processes.

Rock cycle

A model that illustrates the origin of the three basic rock types and the interrelatedness of Earth materials and processes.


Unconsolidated particles formed by weathering and erosion of rock, by chemical precipitation from solution in water, or from the secretions of organisms and transported by water, wind, or glaciers.

Sedimentary rock

Rock created from the weathered products of preexisting rocks that have been transported, deposited, and lithified.


Parallel layers of sedimentary rock.


The shape, size, and distribution of the particles that collectively constitute a rock.


Igneous rock made of up iron and magnesium-rich minerals.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording