Metamorphic Rocks Slate And Marble

Slate forms when shale which consists of clay minerals is put under pressure with temperatures of a few hundred degrees or so.

Metamorphic rocks slate and marble. Slate is a low grade metamorphic rock with a dull luster and strong cleavage. Metamorphic rocks arise from the transformation of existing rock types in a process called metamorphism which means change in form. Determining whether a rock is metamorphic as opposed to igneous or sedimentary can be difficult. Foliated metamorphic rocks such as gneiss phyllite schist and slate have a layered or banded appearance that is produced by exposure to heat and directed pressure.

The original rock is subjected to heat temperatures greater than 150 to 200 c and pressure 100 megapascals 1 000 bar or more causing profound physical or chemical change the protolith may be a sedimentary igneous or existing metamorphic rock. Sedimentary rocks may become slate or marble while igneous rocks become gneiss and carbon becomes diamonds. Pictures and brief descriptions of some common types. Many rocks used in architecture and design are metamorphic like slate and marble.

Non foliated metamorphic rocks such as hornfels marble quartzite and novaculite do not have a layered or banded appearance. Metamorphic rocks form when sedimentary or igneous rocks come under a lot of pressure that squeezes them and forces their molecules into a new structure. Metamorphic rocks may form from rocks heated by nearby magma what are metamorphic rocks like. The layers in slate formed.

It is derived from shale by regional metamorphism.