Home Rocks Metamorphic Rocks Marble

Marble

SHARE

Marble is a granular metamorphic rock, it is derived from limestone or dolomite and It consists of a mass of interlocking grains of calcite or the mineral dolomite. Form of it when limestone buried deep in the older layers of Earth’s crust is subjected to heat and pressure from thick layers of overlying sediments. It may also form as a result of contact metamorphism near igneous intrusions. Impurities in the limestone can recrystallize during metamorphism, resulting in mineral impurities in the marble, most commonly graphite, pyrite, quartz, mica, and iron oxides. In sufficient amounts, these can affect the texture and color of the marble.

Name origin: The word “marble” derives from the Ancient Greek mármaros, “crystalline rock, shining stone”

Taj Mahal, India The Taj Mahal is built of Makrana—a white marble that changes hue with the angle of the light.

Physical Properties of Marble

  • Colour: White, pink
  • Derived: Limestone, dolomite
  • Grain size – medium grained; can see interlocking calcite crystals with the naked eye.
  • Hardness – hard, although component mineral is soft (calcite is 3 on Moh’s scale of hardness)
  •  Structure: Massive
  • Group: Metamorphic Rocks
  • Texture: Granoblastic, granular.
  • Formation: Regional or contact metamorphic
  • Acid Reaction:   Being composed of calcium carbonate, marble will react in contact with many acids, neutralizing the acid. It is one of the most effective acid neutralization materials. It is often crushed and used for acid neutralization in streams, lakes, and soils.
  • Hardness:   Being composed of calcite, marble has a hardness of three on the Mohs hardness scale. As a result, It is easy to carve, and that makes it useful for producing sculptures and ornamental objects. The translucence of marble makes it especially attractive for many types of sculptures.
  • Ability to Accept a Polish:   After being sanded with progressively finer abrasives, It can be polished to a high luster. This allows attractive pieces of marble to be cut, polished, and used as floor tiles, architectural panels, facing stone, window sills, stair treads, columns, and many other pieces of decorative stone.
  • Major minerals of Marble: Calcite
  • Accessory minerals of Marble: Diopside, tremolite, actinolite, dolomite

Physical Origins of Marble

Marble is a rock on account of metamorphism of sedimentary carbonate rocks, maximum normally limestone or dolomite rock. Metamorphism causes variable recrystallization of the unique carbonate mineral grains. The ensuing this rock is typically composed of an interlocking mosaic of carbonate crystals. Primary sedimentary textures and structures of the unique carbonate rock (protolith) have typically been changed or destroyed.

Chemical Composition

It is made of mostly Calcium carbonate (CaCo3) with minor amounts Silica, magnesium carbonate, Silica, Iron oxide, Aluminium oxide etc.

Formation of the Marble

At the beginning, the metamorphism of the limestone and 1200-1,500 bar and between 125-180 degrees Celsius remote exposure to high pressure and temperature of the marble there.

The metamorphism of the limestone is required by marble, extra iron and graphite (in smaller quantities). As the metamorphism progresses, the crystals grow and the interlocking calcite Changing colors are the result of the duration of the impurity function and metamorphosis

https://qph.fs.quoracdn.net/main-qimg-c5d7c39130bf906ca5278bdbdfad8c21-c
Convergent boundary

Where is It Located

Marble deposits can be found in various countries around the globe. Such European countries as Italy, Ireland, Spain, Greece, Russia, Romania, Sweden, and Germany, in addition to others in Asia, are among the globe’s leading producers of this valuable rock. The United States of America is also a high level Marble producer, with states such as Alabama and Texas having especially large deposits to be found within their borders. It is, however, Italy, China, India, and Spain who dominate global Marble production.

Uses Area of Marble

Marble takes place in massive deposits that may be hundreds of toes thick and geographically good sized. This permits it to be economically mined on a large scale, with a few mines and quarries generating tens of millions of lots in keeping with yr.

Most of these rock is made into either crushed stone or dimension stone. Crushed stone is used as an aggregate in highways, railroad beds, constructing foundations, and different kinds of construction. Dimension stone is produced by sawing marble into portions of particular dimensions. These are utilized in monuments, buildings, sculptures, paving and other projects. We have an article about “the makes use of of marble” that includes pictures and descriptions of marble in many kinds of makes use of

Facts About Rock

  • It is usually white in color but may be of different colors.
  • It has been used in sculpture and flooring since ancient times.
  • Taj Mahal in India is completely made of marble.
  • It usually occurs as limestone or dolomite.
  • Calcite and dolomite crystals and aragonite are the main components of marble.
  • Contamination is the color of marble.
  • It is typically found among other metamorphic rocks such as gneiss and mica schists.

References

Bonewitz, R. (2012). Rocks and minerals. 2nd ed. London: DK Publishing.https://www.amazon.com/Nat-Gd-Minerals-Nature-Guides/dp/0756690420

Cite this article as: Geology Science. (2019). Marble. [online] Available at: http://geologyscience.com/rocks/metamorphic-rocks/marble/ [9th December 2019 ]
SHARE