Natural Indian Minerals
Fire Clay Minerals

Name and Composition - Siliceous or aluminous clay; a variety of kaolinite capable of withstanding high temperatures: AI4 (Si4O10) (OH)8.

Physical Properties - It is a group of refractory clays which can withstand temperature around 1700 C resulting high fusion point and good plasticity.

Mode of Occurrence - It has two mode of occurrences.
1. Fairly well defined beds are found associated with lignite/coal seams.
2. Lenticular beds are associated with other coarser sediments.

Uses - It is used for the manufacture of fire bricks (refractory bricks), sanitary wares, resorts, crucibles, mortars, foundry, insecticides etc.

Mineral based Industries – Refractory, Ceramic industries, insecticide industries.

Industrial Prospects – Refractory, Ceramic industries, insecticide industries.


Physical Properties
Hardness
Sp. gr.
Apparent Porosity
Water Absorption
2.0 to 2.5
2.61 to 2.68
7.42 to 8.06 %
3.14 to 3.46 %
Chemical Properties
Silica (SiO2)
Alumina (Al2O3)
Ferric Oxide (Fe2O3)
Titanium Dioxide (TiO2)
Magnesium Oxide (MgO)
Calcium Oxide (CaO)
Potassium Oxide (K2O)
Sodium Oxide (Na2O)
Loss on Ignition
50-60%
23-34%
0.5 - 1 %
0.75 - 1.25%
< .5%
< 1%
< .5%
< .5%
6-27%
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