How do you classify metamorphic rocks?

Metamorphic rocks are broadly classified as foliated or non-foliated. Non-foliated metamorphic rocks do not have aligned mineral crystals. Non-foliated rocks form when pressure is uniform, or near the surface where pressure is very low.

What are metamorphic rocks definition for kids?

More information. A metamorphic rock is a result of a transformation of a pre-existing rock. The original rock is subjected to very high heat and pressure, which cause obvious physical and/or chemical changes. Examples of these rock types include marble, slate, gneiss, schist.

What are the 4 types of metamorphic rocks?

Common metamorphic rocks include phyllite, schist, gneiss, quartzite and marble.

What are the 3 kinds of criteria that are normally employed in classifying metamorphic rocks?

Classification of metamorphic rocks is based on mineral assemblage, texture, protolith, and bulk chemical composition of the rock.

How are metamorphic rocks classified quizlet?

How are metamorphic rocks classified? Metamorphic rock is classified by texture and composition. The texture can be foliated or nonfoliated.

What are metamorphic rocks characteristics?

Metamorphic rocks were once igneous or sedimentary rocks, but have been changed (metamorphosed) as a result of intense heat and/or pressure within the Earth’s crust. They are crystalline and often have a “squashed” (foliated or banded) texture.

How are rocks classified?

There are two different ways that rocks are often classified; the first is based on the processes by which they form, in which rocks are classified as either sedimentary, igneous, and metamorphic. Rocks are also commonly classified by grain or crystal size.

What are the two types of metamorphic rocks for kids?

Metamorphic rocks are often found in mountainous areas. There are two types of metamorphism: contact metamorphism and regional metamorphism. Contact metamorphism, also called thermal metamorphism, is when magma changes broken rocks near the surface of the earth.

What are the characteristics of metamorphic rocks?

What are the 2 categories of metamorphic rocks?

There are two main types of metamorphic rocks: those that are foliated because they have formed in an environment with either directed pressure or shear stress, and those that are not foliated because they have formed in an environment without directed pressure or relatively near the surface with very little pressure …