Marble Metamorphic Rock Grade

Metamorphic rocks form from pre existing rocks parent rocks due to changes in either temperature pressure or volatiles within the earth often by a combination of all three.

Marble metamorphic rock grade.

The specimen shown above is about two inches five centimeters across. Lapis lazuli the famous blue gem material is actually a metamorphic rock. Volatiles are those chemical substances including water and carbon dioxide that easily turn into gas or fluid and are mobile enough to move in and out of solid rock. Metamorphic rocks arise from the transformation of existing rock types in a process called metamorphism which means change in form.

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. As already noted slate is formed from the low grade metamorphism of shale and has microscopic clay and mica crystals that have grown perpendicular to the stress. What is the metamorphic grade of marble. It is composed primarily of the mineral calcite caco 3 and usually contains other minerals such as clay minerals micas quartz pyrite iron oxides and graphite.

Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. Variable grade regional or contact metamorphism along a convergent. Metamorphic rock can be marble because marble is a form of metamorphic rock which is composed of coarse crystals from parent limestone or dolostone rocks. Metamorphic grade refers to the degree of heat and pressure needed to create a particular metamorphic rock out if its parent rock.

It is composed primarily of calcium carbonate. The various types of foliated metamorphic rocks listed in order of the grade or intensity of metamorphism and the type of foliation are slate phyllite schist and gneiss figure 7 8. But grain size is also dependent on the grain size of the protolith.