Metamorphic Black Marble Rock

Although metamorphic rocks typically form deep in the planet s crust they are often exposed on the surface of the earth.

Metamorphic black marble rock. Like other metamorphic rocks marble has no fossils and any layering that appears in it probably does not correspond to the original bedding of the precursor limestone. Metamorphic rock any rock that results from the alteration of preexisting rocks in response to changing conditions such as variations in temperature pressure and mechanical stress and the addition or subtraction of chemical components. The color of marble can range from the purest white to black ranging through the warmer colors in between depending on the other mineral impurities. The preexisting rocks may be igneous sedimentary or other metamorphic rocks.

Marble granular limestone or dolomite i e rock composed of calcium magnesium carbonate that has been recrystallized under the influence of heat pressure and aqueous solutions. 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 under the conditions of metamorphism the calcite in the limestone recrystallizes to form a rock that is. Marble is a metamorphic rock formed when limestone is subjected to high pressure or heat. Marble forms under such conditions because the calcite forming the limestone recrystallises forming a denser rock consisting of roughly equigranular calcite crystals.

Limestone a sedimentary rock will change into the metamorphic rock marble if the right conditions are met. Petrographically marbles are massive rather than thin layered and consist of a. Marble marble is a metamorphic rock formed when limestone is exposed to high temperatures and pressures. 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.

Non foliated metamorphic rocks such as hornfels marble quartzite and novaculite do not have a layered or banded appearance. In its pure form marble is a white stone with a crystalline and sugary appearance consisting of calcium carbonate caco 3 usually marble contains other minerals including quartz graphite pyrite and iron oxides these minerals can give marble a pink brown gray green or variegated coloration. Commercially it includes all decorative calcium rich rocks that can be polished as well as certain serpentines verd antiques. The variety of colours exhibited by marble are a consequence of minor amounts of impurities being incorporated with the.

Marble is commonly used for sculpture and as a building material. Marble is a metamorphic rock composed of recrystallized carbonate minerals most commonly calcite or dolomite marble is typically not foliated although there are exceptions in geology the term marble refers to metamorphosed limestone but its use in stonemasonry more broadly encompasses unmetamorphosed limestone.