Metamorphic means, "change of form." Metamorphic rocks are rocks that have formed due to changes in volcanic or sedimentary rock.

one of the three types or classes of rocks. Metamorphic rocks are formed when sedimentary, igneous, or older metamorphic rocks undergo physical (textural) or chemical changes that have caused by heat, pressure, or chemical reactions.

A rock derived from pre-existing rocks by way of mineralogical, chemical, or structural changes. These changes come in response to marked changes in temperature, pressure, shearing stress, or the chemical environment. Metamorphism generally occurs at depth in the Earth's crust. Metamorphic rocks represent one of the three main classes of rocks, the other two being igneous and sedimentary rocks.

Rock that has been changed from sedimentary or igneous through heat or pressure. Most of the rock in the Adirondacks is of this type. Metamorphic rock is the most weather resistant type of rock so the Adirondacks should be here a long time.

Rock of any origin altered in mineralogical composition, chemical composition, or structure by heat, pressure, and movement. Nearly ail such rocks are crystalline.

Rock that has been changed by the action of heat and pressure.

A rock whose original mineralogy, texture, or composition has been changed by the effects of pressure, temperature, or the gain or loss of chemical components.

Rock formed from heat and pressure that changes the original minerals or texture of a previous rock, such as another metamorphic rock, igneous rock, or sedimentary rock.

Rock produced when a preexisting rock is subjected to high temperatures (which may cause it to melt partially), high pressures, chemically active fluids, or a combination of these agents. See rock cycle. Compare igneous rock, sedimentary rock.

an igneous or sedimentary rock that has been chemically or structurally changed by heat or pressure

Rock that forms when preexisting rock changes into new rock as a result of an increase in pressure and temperature and/or shearing under elevated temperatures; metamorphism occurs without the rock first becoming a melt or a sediment.

a rock derived from preexisting rocks by mineralogical, chemical, and structural alterations caused by processes within the earth's crust. Marble is a metamorphic rock.

Metamorphic refers to rocks derived from pre-existing rocks by mineralological, chemical, structural changes.

Rocks that have changed form through high pressure and heat. Examples are marble, gneiss and slate.

Metamorphic rocks are the result of the transformation of preexisting rocks (igneous, sedimentary, or metamorphic) through the process of metamorphism. Metamorphism refers to mineralogical, textural, and/or chemical changes that occur when a rock is subjected to changes in temperature, pressure, and/or chemical environment. Metamorphic changes occur in the solid state, i.e., in the absence of melting.

A rock that has formed from another rock (without melting) in response to changes in temperature, pressure and chemical environment, generally well below the surface of the earth.

rock altered in physical structure and/or chemical composition by action of heat, pressure, or shearing

Igneous or sedimentary rock which has been physically and chemically changed in character and/or appearance. For instance, limestone sometimes transforms into marble.

Any rock formed from preexisting rocks by solid state recrystallization driven by changes in temperature and pressure and by chemical action of fluids.

rock that has undergone structural and mineral changes due to changes in temperature, pressure, and chemical environment.

Rock that has been physically altered by heat and/or pressure.

rock altered by pressure and heat

an aggregate of minerals formed by the recrystallization of pre-existing rocks in response to a change of pressure, temperature, or volatile content

a previously existing rock that has acquired a new mineral composition or new structures, or commonly both

a rock that has changed from its original form

_Rock that has been altered from itsoriginal form by heat end pressure at great depths.

A rock that has been heated and compressed so that it recrystallizes, but does not melt.

Preexisting rock that is restructured by high temperature and pressure.

Rock that has been changed by heat, pressure and chemically active fluids resulting in deformation and recrystalization to varying degrees. Slate is an example of a metamorphic rock found in Cornwall.

One of the three classes of rock making up the earth’s surface; formed from igneous and sedimentary rocks that were changed by heat, pressure, and hydrothermal solutions. See igneous Rock and Sedimentary Rock.

Metamorphic rock is formed when either sedimentary or igneous rock is altered by heat, pressure and/or chemical reaction (with the exception of chemical weathering). One example is quartzite.

a rock that has been chemically and physically changed by being subjected to heat and pressure, usually deep within the earth.

It is a secondary rock which is formed from an original rock with the help of heat or pressure.

Any rock formed deep within the earth from pre-existing rock material as the result of high temperatures and pressures, or by reaction with chemically active fluids.

Rock altered in appearance, density, and crystalline structure and in some cases mineral composition, by high temperature or high pressure or both. Slate is derived from shale, quartzite from quartz sandstone and true marble from limestone.

Rock which is changed physically and sometimes chemically when subjected to heat and pressure

Rock that is formed when sedimentary or igneous rocks are altered (but not completely melted) by geologic forces.

A rock that has undergone chemical or structural changes produced by increase in heat or pressure, or by replacement of elements by hot, chemically active fluids.

rock composed of sedimentary and igneous rocks that have been altered by temperature, pressure and chemistry. Includes gneiss and schist rocks.

Rock formed underground by the alteration of pre-existing rock through pressure, heat, and/or chemically active liquids.

A rock converted from pre-existing rock in the earth's crust by changes in temperature and pressure or by chemical action of fluids.

a rock formed when preexisting rocks undergo mineralogical, chemical, and structural changes caused by high temperature, pressure, and other factors.

Any igneous or sedimentary rock that has been altered by changing into magma, and then solidifying back to rock again.

rock that has been altered by conditions of high temperature and/or pressure.

A rock that has changed after being subjected to heat and/or pressure. For example limestone is a sedimentary rock which, if subjected to heat and/or pressure, changes to the metamorphic rock called marble. Slate is a metamorphic rock derived from shale.

A type of rock that is the result of the transformation of a pre-existing rock type by heat and/or pressure. Examples of metamorphic rock: Marble, Slate, Gneiss and Schist.

Formed when igneous, sedimentary, or other metamorphic rocks recrystallize in response to elevated temperature, increased pressure, chemical change, and/or deformation.

A rock formed from preexisting solid rocks by mineralogical, structural, and chemical changes, in response to extreme changes in temperature, pressure, and shearing stress.

Rock that has changed shape or form by heat and/or pressure.

a rock which has undergone chemical and or structural transformation from its original solid form

Any rock derived from other rocks by chemical, mineralogical and structural changes resulting from pressure, temperature or shearing stress.

rock formed from igneous or sedimentary rocks due to pressure, heat (though not melted), or chemical conditions below the Earth's surface

One of the three principal varieties of rock, along with sedimentary and igneous rock. Metamorphic rock is formed through the alteration of preexisting rock as a result of changes intemperature, pressure, or the activity offluids. These changes are known as metamorphism.

rocks, which were originally Igneous or sedimentary rocks, but have been altered in character and appearance. To alter character and appearance these rocks were subjected to severe pressure and extremely high temperatures.

Pressure 'cooked' rocks altered by heat and pressure within the Earth's crust. One of the most common metamorphic rocks in Britain, is Slate

Any rock derived from pre-existing rocks by mineralogical, chemical, and structural changes, essentially in the solid state, in response to marked changes in temperature, pressure, shearing stress, and chemical environment at depth in Earth's crust (for example, gneisses, schists, marbles, quartzites, etc.).

a rock that is formed from igneous or sedimentary rocks by elevated pressure and temperature without melting.

a rock derived from a pre-existing rock that has been changed in its minerals, chemistry and structure in response to changes in temperature, pressure and stress.

A changed rock formed by the recrystallization of minerals in an existing rock by heat and pressure.

Rock whose original textures or mineral components, or both, have been transformed to new texture and components as a result of high temperature, high pressure, or both.

igneous or sedimentary rock that has changed because of high temperature, high pressure, and the chemical environment while deep in the crust of the earth. Examples: marble, slate, gneiss.

Rocks which have been produced from other rocks by high temperatures and/or pressures.

Metamorphism is a process that takes place when the heat and pressure deep in the Earth's crust cause rocks to change their original mineral compositions and textures. The resulting metamorphic rocks can form from igneous, sedimentary or older metamorphic rocks

Rock that has undergone transformation by natural agencies such as heat and pressure.

a rock formed by recrystallisation in the solid state, in response to pressure and temperature.

Rock which has been altered and changed in crystalline form, in the solid state, by the effects of heat and / or increased pressure.

Either igneous rock or sedimentary rock, which has been changed from its original from by the effect of heat or pressure or both in combination.

Igneous and sedimentary rocks modified by heat, pressure, and chemical reactions.

A rock that has undergone chemical or structural changes. Heat, pressure, or a chemical reaction may cause such changes.

A rock that has been derived from other rocks by heat and pressure. The original rock may have been igneous, sedimentary, or another metamorphic rock.

Sedimentary or igneous rock, which has undergone a change as a result of pressure, heat or chemical, making combinations of colors that, are twisted and curved to form interesting patterns. Often used as flagstone pavers, for retaining walls or siding, when cut into sections.

A rock that forms from the recrystallization of igneous, sedimentary, or other metamorphic rocks through pressure increase, temperature rise, or chemical alteration.

Metamorphic rocks are compacted by pressure and heat from deep inside the earth.

Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means "change in form". The protolith is subjected to heat (greater than 150 degrees Celsius) and extreme pressure causing profound physical and/or chemical change. The protolith may be sedimentary rock, igneous rock or another older metamorphic rock.