Take a look at some of the handpicked varieties of high quality marbles from our huge collection.
Read More About Marbles :
Marble ores are 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 make up. 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.
The minerals that result from impurities give marble a wide variety of colours. The purest calcite marble is white in colour. Marble containing hematite are reddish in color. Marble that has limonite is yellow, and marble with serpentine is green in colour.
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 channelling 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.
Use of Marble :
- Very pure calcite marble is used for most statues.
- Large blocks of coloured marble are used for columns, floors, and other parts of building.
- Marble sliced in various sized tiles is widely used in bathroom, kitchen and flooring of homes.
- 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.
Physical Properties of Marble :
Physically, these are recrystallized, Hard, Compact, fine to very fine grained metamorphosed rocks capable of taking shining polish.
|Hardness||3 to 4 on Moh’s Scale|
|Density||2.55 to 2.7 Kg/cm3|
|Compressive Strength||70 to 140 N/mm2|
|Modulus of Rupture||12 to 18 N/mm2|
|Water Absorption||Less than 0.5%(except Rainforest Green/Brown with 2-3%)|
Chemical Properties of Marble :
Chemically Marbles are crystalline rocks composed predominantly of calcite, dolomite or serpentine minerals. The other minor constituents vary from origin to origin
|Silica (SiO2)||3-30% (varies with variety)|
|MgO||20 to 25%|
|FeO + Fe2O3||1-3%|
|Loss On Ignition (LOI)||20-45%|