Content on this page requires a newer version of Adobe Flash Player.

Get Adobe Flash player



manufacture the products as per the Customer requirements
Our Group

Powdered Minerals are used as fillers in many industries. We have adopted such technique that we can manufacture the products as per the Customer requirements. We at AMI are pleased to state that we can formulate / Grind the Raw Minerals in the Powder Form, which is available from 100 Mesh - 700 Mesh. We offer Soap Stone Powder / Talc of 10 Micron to 50 Micron with the Brightness and Whiteness from 80% - 98%.


Also we specialize in producing Micronised Calcite and Micronised Dolomite available from 2 Micron to 20 Micron.

Soapstone/ Talc
Dolomite/ Limestone
China Clay

Soapstone/ Talc Powder

TalcTalc is the world's softest mineral. Although all talc ores are soft, platy, water repellent and chemically inert, no two talcs are quite the same. Talc is a vital part of everyday life. The magazines we read, the polymers in our cars and houses, the paints we use and the tiles we walk on are just some of the products that talc enhances.

Talc is a hydrated magnesium sheet silicate with the chemical formula Mg3Si4O10(OH)2. The elementary sheet is composed of a layer of magnesium-oxygen/hydroxyl octahedra, sandwiched between two layers of silicon oxygen tetrahedra. The main or basal surfaces of this elementary sheet do not contain hydroxyl groups or active ions, which explains talc's hydrophobicity and inertness.

Talc is practically insoluble in water and in weak acids and alkalis. It is neither explosive nor flammable. Although it has very little chemical reactivity, talc does have a marked affinity for certain organic chemicals, i.e. it is organophilic. Above 900°C, talc progressively loses its hydroxyl groups and above 1050°C, it re-crystallizes into different forms of enstatite (anhydrous magnesium silicate). Talc's melting point is at 1500°C.


S. No. Parameter Percentage 
1 Loss on Ignition 4% to 6%
2 Loss on Drying 0.05%
3 Acid soluble substances (as SO4) 2% to 3%
4 Extractable Fluoride 0.2% to 20%
5 pH (at 10%) 8.5% to 9.5%
6 Soluble Salts 0.2%
7 Absorption in Oil 30 to 35
8 Asbestos Fibers Nil
9 Arsenic Nil
10 SiO2 60 to 67
11 MgO 29 to 32
12 Fe2O3 0.15
13 CaO As per requirement
14 Al2O3 0.6% to 1%

Dolomite /Limestone Powder

DolomiteOur exclusive grade dolomite powder is suitable for Steel industries.

Dolomite was named for the French mineralogist Deodat de Dolomieu. The mineral dolomite is commonly found in deposits of a sedimentary rock called dolostone. There are two types of materials often called dolomite, a true chemically uniform calcium magnesium carbonate with the chemical formula CaMg(CO3)2, and a dolomite limestone, which is just an irregular mixture of calcium and magnesium carbonates.

Dolomite is believed to have formed by replacement of some of the calcium in a calcium carbonate limestone deposit with magnesium, while the sediment was undergoing lithification, being converted from layers of dead clam and other sea animal shells into crystallized calcite or calcium carbonate. The resultant dolomite mineral, CaMg(CO3)2 is a true double salt. The calcium and magnesium ions in dolomite exist in separate layers in the crystal matrix. Dolomite has a calcium layer, then a carbonate layer, then a magnesium layer then a carbonate layer, and so on.

Dolomite is harder and denser than the calcite form of calcium carbonate or limestone, and is more chemically inert and more impervious to acid attack.



Sr. no. Parameter Percentage
1 SiO2 0.77 to 7%
2 CaO 28 to32%
3 MgO 18 to 22 %
4 Fe2O3 0.30 to 0.60 %
5 Al2O3 0.27 to 0.35 %
6 LOI 43 to 47 %
7 CACO3 50 to 55 %

Uses For Dolomite

The inherent differences between dolomite and calcite drive the applications for dolomite. Dolomite is chosen for many construction and building product applications due to its increased hardness and density. Asphalt and concrete applications prefer dolomite as a filler for its higher strength and hardness. Dolomite also finds use in a number of applications as a source of magnesium such as glass and ceramics manufacture, as well as a sintering agent in iron ore pelletization and as a flux agent in steel making. Farmers use dolomite for agricultural pH control. The chemical industry uses the mineral dolomite in making magnesium salts including magnesia, magnesium oxide (MgO), which is used in pharmaceuticals.

As an industrial mineral, dolomite’s usage is significantly less than calcite’s. This is primarily due to the relative lack of high brightness deposits of dolomite. The alteration process that forms dolomite tends to bring in additional impurities that reduce brightness or tint the stone brown or gray. In regions where high brightness dolomites do exist, they share many of the applications of calcium carbonate.




icon  Ceramic (Whiteware) icon  Paint

 Steel Industries

icon  Vitrified Enamels icon  Electrode
[Soapstone/ Talc] [Dolomite/ Limestone] [Calcite] [Quartz] [Feldspar] [China Clay]