Marble Metamorphic Rock Grade

Lapis lazuli the famous blue gem material is actually a metamorphic rock.

Marble metamorphic rock grade.

Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. High grade metamorphic rocks tend to be coarse grained. 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. 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. Marble is a non foliated metamorphic rock that is produced from the metamorphism of limestone or dolostone. But grain size is also dependent on the grain size of the protolith. Low grade metamorphic rocks tend to be fine grained the newly formed metamorphic mineral grains that is.

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. 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. Variable grade regional or contact metamorphism along a convergent. It is composed primarily of calcium carbonate.

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. 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.