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April 23, 2021

About Marble

by crystaltile_expert / Wednesday, 10 May 2017 / Published in Uncategorized

MARBLE

The Lincoln Memorial, also in Washington, was built of marble from Alabama, Colorado, and Georgia. Very pure calcite marble is used for most statues. They are translucent. Large blocks of colored marble are used for columns, floors, and other parts of buildings. Smaller pieces of marble are crushed or finely ground and used as abrasives in soaps and other such products. Crushed or ground marble is also used in paving roads and in manufacturing roofing materials and soil treatment products.

CHEMICAL COMPOSITION

Indian marble has the following main chemical constituents in its composition:
Soluble residue – 0.89%

Fe2o3 – 0.28%
CaCo3 – 97.74%
MgCo3 – 1.22%
Phosphoric Acid – 0.04%

USES

Marble has always been highly valued for its beauty, strength, and resistance to fire and erosion. The ancient Iranian & Greeks were good user of marble in their buildings and statues. The Italian artist Michelangelo used marble from Carrara, Italy, in a number of sculptures. Marble from Tennessee was used in parts of the National Gallery of Art in Washington, D.C.
The Lincoln Memorial, also in Washington, was built of marble from Alabama, Colorado, and Georgia. Very pure calcite marble is used for most statues. They are translucent. Large blocks of colored marble are used for columns, floors, and other parts of buildings. Smaller pieces of marble are crushed or finely ground and used as abrasives in soaps and other such products. Crushed or ground marble is also used in paving roads and in manufacturing roofing materials and soil treatment products.

TEXTURES

Marbles show variety of textures on account of existing minerals & re-crystallization patterns. Texture depends upon form, size, uniformity of grain arrangements. Marbles can be classified on the basis of the following factors :

Calcite Marble – Mostly CaCo3; MgCo3<0.50%
Dolomite Marble – Having > 40% MgCo3
Magnesium Marble – MgCo3 between 5 to 40%
Serpentine Marble – remobilised marble due to the effect of Thermodynamic metamorphic wherein serpentine is prominent
Onyx Marble – Lime carbonate deposition on account of cold water solution activity

MINERAL IMPURITIES

The following are the major mineral impurities in marble:

  • Quartz
  • Tremolite Actinolite
  • Chert
  • Garnet
  • Biotite
  • Muscovite
  • Microline
  • Talc
  • Fosterite

CHEMICAL IMPURITIES

The following are the major chemical impurities in marble:

  • SiO2
  • Fe2O3
  • 2Fe2O3
  • 3H2O
  • Limonite
  • Manganese
  • Al2O3
  • FeS2 (pyrite)

PHYSICAL PROPERTIES

Marble, formed from limestone with heat and pressure over years in the earth’s crust. These pressure or forces cause the limestone to change in texture and makeup. The process is called recrystallization. Fossilized materials in the limestone, along with its original carbonate minerals, recrystallize and form large, coarse grains of calcite.  Impurities present in the limestone during the recrystallization period affect the mineral composition of the marble which is formed. At relatively low temperatures, silica impurities in the carbonate minerals form masses of chert or crystals of quartz.

At higher temperatures, the silica reacts with the carbonates to produce diopside and forsterite. At a very high temperatures, rarer calcium minerals, such as larnite, monticellite, and rankinite, forms in the marble. If water is present, serpentine, talc, and certain other hydrous minerals may be produced.

The presence of iron, alumina, and silica may result in the formation of hematite and magnetite. Marble does not split easily into sheets of equal size and must be mined with care. The rock may shatter if explosives are used. Blocks of marble are mined with channeling machines, which cut grooves and holes in the rock. Miners outline a block of marble with rows of grooves and holes. They then drive wedges into the openings and separate the block from the surrounding rock. The blocks are cut with saws to the desired shape and size.

 

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Showroom
23 Apex Road. Toronto,
ON M6A 2V2
Tel: 416.781.5671
Fax:416.781.1389

Slab Division
23 Apex Road Toronto,
ON M6A 2V2
Tel: 416.781.5671
Fax:416.781.1389

Fabrica Division
20 Apex Rd. Toronto,
ON M6A 2V2
Tel: 416.781.5671
Fax: 416.781.1389

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