Natural Indian Minerals
Dolomite Minerals

Name and Composition - carbonate of calcium and magnesium: Ca Mg(CO3)2. Also called pearl–spar. When MgO is about 21.7% and SiO2 is less than 2 %, it is of SMS grade.

Physical Properties - White to yellowish, brown coloured, fine to coarse grained, mono-mineralic rock. Grains are generally rhombohedral, hardness is 3.5-4.0 and sp.gr.is 2.86.

Mode of Occurrence - Occurs as massive and bedded rock of metamorphic and sedimentary origin.

Uses - It is used as a flux in iron ore smelting, refractories, for manufacturing of high magnesium lime paper, glass, soil conditioning, chemical and fertilizers; as filler in paint, varnishes and hardening reagent in rubber goods. It is also used as an ore of magnesium; in manufacturing of beverages, in coal mines.

Mineral based Industries – Dolomite based industries like crushing & pulverizing units, chips making units, chemical plants.

Industrial Prospects – Crushers and refractory industries.


Physical Properties
Hardness
Sp. gr.
Luster
Fracture
3.5 to 4.0
2.84 to 2.86
Vitreous to pearly
Conchoidal
Chemical Properties
MgO
CaO
SiO2
Al2O3
Fe2O3
MnO
MgO
Na2O
K2O
P2O5
LOI
19.52%
29%
13.54%
0.56%
0.86%
0.02%
0.02%
0.08%
0.03%
0.01%
35.18%
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