Marble Metamorphic Rock Grade

Marble is a non foliated metamorphic rock that is produced from the metamorphism of limestone or dolostone.

Marble metamorphic rock grade.

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. High grade metamorphic rocks tend to be coarse grained. But grain size is also dependent on the grain size of the protolith.

Lapis lazuli the famous blue gem material is actually a metamorphic rock. 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. 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. The specimen shown above is about two inches five centimeters across.

Metamorphic grade refers to the degree of heat and pressure needed to create a particular metamorphic rock out if its parent 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. It is composed primarily of calcium carbonate. Metamorphic rocks arise from the transformation of existing rock types in a process called metamorphism which means change in form.

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. 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.