Andalusite

Short Description:

Andalusite is an aluminosilicate mineral, which is the raw material for making refractory materials and porcelain in spark plugs. It is a typical mineral of low-grade thermal metamorphism, and is commonly found in mudstones in contact with metamorphic zones. It is mainly formed under the conditions of high geothermal gradient and low pressure to temperature ratio.

Andalusite is generally columnar crystal, and its cross section is almost square. Andalusite crystals gather together into radial or granular shapes. People often call the radial andalusites “chrysanthemum stones”, which means that they are like the petals of a chrysanthemum.


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Description


Andalusite is an aluminosilicate mineral, which is the raw material for making refractory materials and porcelain in spark plugs. It is a typical mineral of low-grade thermal metamorphism, and is commonly found in mudstones in contact with metamorphic zones. It is mainly formed under the conditions of high geothermal gradient and low pressure to temperature ratio.

Andalusite is generally columnar crystal, and its cross section is almost square. Andalusite crystals gather together into radial or granular shapes. People often call the radial andalusites "chrysanthemum stones", which means that they are like the petals of a chrysanthemum.

Features

Andalusite is pink, red, purple, green, red-brown, off-white, gray-yellow and light green, with glass luster. Some good quality and transparent andalusite crystals are also regarded as gems.

Andalusite is heated to 1300℃ to become mullite, which is a high-grade refractory material

Application

Andalusite can be used as high-grade refractories in the smelting industry, refractory bricks, and raw materials for technical ceramics industries. It can also be used to smelt high-strength lightweight silicon-aluminum alloys to make metal fibers and guide-type supersonic aircraft and spacecraft

Physical And Chemical Indicators

Grade Al2O3 SiO2 Fe2O3 TiO2 CaO MgO Na2O K2O Size
55% 55.0 42.5 1.20 0.3 -- -- 0.50 0-1mm,1-3mm,200mesh
56% 56.0 41.5 1.20 0.3 -- -- 0.50 0-1mm,1-3mm,3-5mm,200mesh
57% 57.6 40.3 0.80 0.25 0.10 0.15 0.10 0.20 0-1mm,1-3mm,3-5mm,200mesh
58% 58.9 38.5 0.80 0.15 0.20 0.10 0.10 0.35 0-1mm

Productive Process

1.Raw material quality control including physical and chemical testing.

2.crushing and grinding of bulk raw materials.

3.Packing after quality testing

Packing And Shipping

Packaging  according to safety sea-exporting packing Standard
Dispatch : loading the finished packing material at factory by container Door toDoor
By 25kg kraft paper bags+sea fumigated wooden pallets


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